Given that the coin has a conservation rating of 75 (MBC), indicating good quality, and considering that it is being auctioned for the first time, the starting price is set at 300 euros.

In previous auctions, the average hammer price is 0, which suggests that there is no historical data that could influence the estimation. However, since the conservation is good and there is interest in the auction, we could estimate a hammer price that might be slightly higher than the starting price.

Taking these factors into account, an estimated maximum purchase price could range between 400 and 500 euros, depending on the interest of collectors and the competition in the auction.

To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Current Condition: The coin has a condition rating of 75 (MBC), indicating that it is in fairly good shape, but not the best possible condition.

2. Auction History:
- The average hammer price for this coin in the past is 242 euros.
- In previous auctions, hammer prices have varied, with a maximum of 900 euros in a recent auction, although this may be an exceptional case.
- Most hammer prices for similar conditions (75) have been in the range of 170 to 280 euros.

3. Starting Price: The current starting price is 250 euros, suggesting that the seller has expectations for a hammer price in that range.

4. Market Trends: Given that the coin has been auctioned 29 times and has had a good sales percentage (26 out of 29), this indicates a consistent interest in the coin.

Based on these factors, an estimated maximum purchase price could be in the range of 280 to 320 euros, considering that the average hammer price is 242 euros and there is potential for the price to rise due to demand and the coin's condition. However, it is important to keep in mind that the final price will depend on the competition in the auction and the willingness of other bidders.

To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Current Condition: The coin has a condition of 75 (MBC), which indicates that it is in an acceptable state, but not in the best condition.

2. Previous Prices: By observing the auction prices of coins with a similar condition (75), we can see that they have reached auction prices that vary, but generally range between 220 and 360 euros in recent auctions.

3. Average Hammer Price: The average hammer price for this coin is 406.24 euros, suggesting that, in general, buyers are willing to pay more than the starting price.

4. Recent Trends: In the most recent auctions, hammer prices have been quite high, even for coins with similar conditions. For example, in a recent auction, a coin with a condition of 75 was sold for 360 euros.

5. Starting Price: The starting price is 175 euros, which is relatively low compared to previous hammer prices.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 350 to 400 euros, considering that the condition is an important factor and that hammer prices have been higher in the past.

Therefore, a reasonable maximum purchase price could be 400 euros.

To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Current Condition: The coin has a condition rating of 80 (MS+), indicating that it is in fairly good shape, but not of the highest quality (PRF).

2. Historical Prices:
- The average hammer price for coins of similar condition (80) has been approximately 280-280 euros in previous auctions.
- In past auctions, hammer prices for coins with a condition of 80 have ranged between 140 and 280 euros, with an average hammer price of 280 euros.

3. Starting Price and Average Hammer Price:
- The current starting price is 150 euros, which is relatively low compared to the average hammer price of 429.45 euros for all auctions of this coin.
- The average starting price of 270.79 euros also suggests that the current starting price is attractive.

4. Sales Trends: The coin has been sold 95% of the times it has been auctioned, indicating good demand.

Based on these factors, an estimated maximum purchase price could be around 280-300 euros, as this is the range where successful sales have occurred in the past for coins of similar condition. This also takes into account the current starting price and interest in the coin.

Therefore, a reasonable maximum purchase price could be 300 euros.

To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Condition: The coin has a condition rating of 80 (MS+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Prices:
- In past auctions, hammer prices have varied. For example, in 2014, a similar coin sold for 360 euros, indicating that there is a market willing to pay high prices for coins in good condition.
- The average hammer price of 240 euros is also a good indicator of market value.

3. Starting Price and Estimates: The current starting price is 200 euros, which is reasonable given the previous average hammer price. However, the estimated price of 250 euros suggests that there is potential for a higher hammer price.

4. Auction Trends: Given that there have been 5 previous auctions and 4 of them resulted in sales, this indicates a consistent interest in the coin. The only time it did not sell could be an isolated case.

5. Comparison with Previous Prices: The last auction had a starting price of 225 euros and an estimated price of 300 euros, suggesting that the market is willing to pay more for coins in similar conditions.

Taking all these factors into account, an estimated maximum purchase price could be around 300 euros, as this is a price that has been estimated in previous auctions and aligns with market interest. However, it is important to consider that the final price may vary depending on competition in the auction and demand at the time.

To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Coin Condition: The coin to be auctioned has a condition rating of 80 (MBC+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Auction Prices: By looking at the hammer prices of coins with similar conditions (70-85), we can see that the hammer prices have varied, but generally, they have been in a range of 125 to 340 euros.

3. Average Hammer Price: The average hammer price for this coin is 246.75 euros, which provides a good reference point.

4. Starting Price: The starting price of 225 euros is an indicator of what is expected to be obtained at the auction, but it does not necessarily reflect the final hammer price.

5. Recent Trends: In the most recent auctions, we have seen hammer prices exceeding the starting price, especially for coins in good condition. For example, in the auction on 2023-03-22, a coin with a condition of 80 was hammered at 340 euros.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 300-350 euros. This is based on the trend of hammer prices for coins of similar condition and the interest that this particular coin may generate.

Given that the coin has a grade of 75 (MBC), indicating good quality, and considering that it is being auctioned for the first time, the starting price is set at 300 euros.

In this case, since there are no historical sales data for this coin, we can estimate a maximum purchase price based on the starting price and the grade.

Generally, in auctions, final prices can vary between 1.5 to 2 times the starting price for coins in good condition. Therefore, an estimated maximum purchase price could be between 450 and 600 euros.

However, since the starting price is 300 euros and there are no sales records, a more conservative estimated price could be around 450 euros.

Thus, the estimated maximum purchase price would be approximately 450 euros.

To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the condition, previous starting and hammer prices, as well as behavior in past auctions.

1. Condition: The coin has a condition of 80 (MBC+), indicating that it is in quite good shape. This is relevant because coins in better condition tend to fetch higher prices.

2. Previous starting and hammer prices:
- The average hammer price for similar coins has been 371 euros.
- In previous auctions, the hammer prices for coins with a similar condition (80) have varied, but there are examples where they have sold for 320 euros and 490 euros.

3. Auction trends:
- The coin has been auctioned 12 times, of which it has sold 10 times, indicating good demand.
- The current starting price is 200 euros, which is slightly higher than the average starting price of 166.5 euros.

4. Estimation:
- Given that the average hammer price is 371 euros and considering that the condition is 80, a hammer price in the range of 300 to 400 euros seems reasonable.
- However, since the starting price is 200 euros, it is likely that bidders will be willing to pay a bit more, but they may not necessarily reach the average hammer price on this occasion.

Based on these factors, an estimated maximum purchase price could be around 350 euros. This reflects a balance between the condition, historical demand, and the current starting price.

To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Current Condition: The coin has a condition of 80 (MS+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Prices: By looking at previous auction prices for coins with a similar condition (80), we can see that they have reached auction prices that vary, but are generally above the current starting price of 250 euros. For example:
- In the 2021 auction, a coin with a condition of 80 sold for 240 euros.
- In the 2020 auction, a coin with a condition of 80 sold for 210 euros.

3. Price Trends: The average auction price for this coin is 267.21 euros, suggesting that, in general, coins of this reference tend to sell for above their starting price.

4. Starting Price and Estimates: The starting price is 250 euros, and the average starting price in previous auctions is 156.72 euros. This indicates that the current starting price is relatively high, but also that there is interest in this coin.

5. Future Auctions: There are 2 auctions scheduled in the coming days, which could increase competition and, therefore, the final auction price.

Taking all these factors into account, an estimated maximum purchase price could be around 300-350 euros. This is based on the highest auction price observed in previous auctions and the good condition of the coin. However, the final price will depend on the competition in the auction and the interest from other bidders.

To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Current Condition: The coin has a condition of 75 (MBC), which indicates that it is in fairly good shape, but not of the highest quality.

2. Auction History:
- The average hammer price for similar coins has been 406.24 euros.
- In previous auctions, coins with a similar condition (75) have reached hammer prices that varied, but some examples are:
- 220 euros (2020-12-16)
- 240 euros (2020-11-19)
- 270 euros (2021-06-22)
- 360 euros (2022-10-19)

3. Starting Price and Average Starting Price:
- The current starting price is 200 euros, and the average starting price in the past has been 162.35 euros.

4. Recent Trends: In the most recent auctions, hammer prices have shown an increase, suggesting a positive trend in interest for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 300 to 400 euros, considering that the average hammer price has been 406.24 euros and that the condition of the coin is good, but not excellent.

Therefore, a reasonable maximum purchase price could be approximately 350 euros.

To estimate a maximum purchase price for the coin in question, let's consider several factors:

1. Condition: The coin has a condition rating of 80 (MS+), which is a good condition and can positively influence its value.

2. Auction History:
- In the past, this coin has been auctioned 3 times and has sold on all occasions.
- Previous hammer prices have been 420, 300, and 260 euros, indicating that interest in the coin is consistent and that it can reach high prices.

3. Starting Price and Average Prices:
- The current starting price is 300 euros, which is above the average starting price of 208.33 euros, suggesting that the seller has high expectations.
- The average hammer price is 326.67 euros, indicating that, on average, similar coins have reached prices close to this value.

4. Recent Trends: In the last auction, the hammer price was 260 euros, which could indicate a slight decrease in interest or in the value of the coin compared to previous auctions.

Taking all these factors into account, an estimated maximum purchase price could be in a range between the average hammer price (326.67 euros) and the highest price reached in the past (420 euros).

Therefore, a reasonable maximum purchase price could be approximately 350-400 euros. This allows for a margin for competition in the auction, considering that interest in the coin remains high.