To estimate a maximum purchase price for the coin with a grade of 80 (MBC+), we can analyze historical data and price trends.

1. Current coin data:
- Starting price: €12
- Grade: 80 (MBC+)

2. Relevant historical data:
- The average hammer price for coins with a similar grade (80) has varied, but it can be observed that in several previous auctions, the hammer prices have ranged from €15 to €30.
- For example, in previous auctions with a grade of 80, the hammer prices have been:
- €15 (2018 auction)
- €20 (2022 auction)
- €25 (2022 auction)
- €30 (2022 auction)

3. Hammer price analysis:
- The average hammer price for coins with a grade of 80 seems to be around €20-25.
- The trend shows that, although there are variations, the hammer price tends to be higher than the starting price.

4. Estimation of the maximum purchase price:
- Given that the average hammer price for coins with a grade of 80 is in the range of €20-30, and considering that the starting price is €12, a reasonable maximum purchase price could be slightly higher than the average hammer price.

Therefore, an estimated maximum purchase price for this coin could be €25. This is based on the trend of previous hammer prices and the grade of the coin.

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

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

2. Auction History:
- The average hammer price in previous auctions is 32.2 euros.
- The coin has been auctioned 31 times, of which it has sold 15 times. This suggests that there is moderate interest in the coin.
- Previous hammer prices for coins with similar conditions (80) have varied, but there are examples of auctions reaching up to 80 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 12 euros, which is quite low compared to the average starting price of 35.53 euros. This could indicate a good buying opportunity.

4. Recent Trends: In the most recent auctions, hammer prices have been in the range of 20 to 40 euros for similar conditions.

Based on these factors, an estimated maximum purchase price could be in the range of 50 to 70 euros. This is based on historical interest, current condition, and average hammer price. However, since the starting price is low, it may be possible to acquire it for a price closer to the lower end of this range.

Therefore, a reasonable estimated maximum purchase price could be 60 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 of 70 (VF-). This indicates that it is in an acceptable state, but not of high quality.

2. Auction History:
- The average hammer price for coins of similar condition (around 70) has been approximately 15 to 20 euros in recent auctions.
- In the past, coins with a condition of 70 have reached hammer prices of up to 45 euros (as seen in the auction on 2020-10-21).

3. Starting Price and Average Starting Price:
- The current starting price is 12 euros, which is relatively low compared to the average hammer price of 32.94 euros.
- The average starting price of 17.98 euros also suggests that there is potential for an increase in the hammer price.

4. Recent Trends:
- In the most recent auctions, the hammer price has ranged between 15 and 30 euros for coins of similar condition.

Based on these factors, an estimated maximum purchase price for this coin could be between 25 and 35 euros. This is based on the historical hammer prices for coins of similar condition and the potential for an increase in the hammer price in the current auction.

Therefore, a reasonable maximum purchase price could be 30 euros.

To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

1. Current Condition: The coin has a condition of 30 (BC+), which indicates that it is not in the best shape. This may affect its value compared to coins in better condition.

2. Previous Auction Prices:
- In 2018, with a condition of 30, it was auctioned for 35 euros.
- In 2022, also with a condition of 75, it was auctioned for 62 euros.
- In 2019, with a condition of 75, it was auctioned for 55 euros.
- In 2024, with a condition of 30, it was auctioned for 100 euros, which is a notably high price, but it could be an exceptional case.

3. Average Auction Price: The average auction price of similar coins is 60.56 euros, which can serve as a reference.

4. Starting Price: The starting price is 25 euros, indicating that the seller expects a reasonable minimum price.

Given that the condition of the coin is 30, and considering the previous auction prices, an estimated maximum purchase price could be between 35 and 55 euros, taking into account that the highest auction price was 100 euros, but that could be an isolated case.

Therefore, a reasonable estimated maximum purchase price could be 50 euros. This is based on the analysis of previous auction prices and the current condition of the coin.

To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Starting Price: 30 euros, which is the initial price of the auction.
2. Condition: The coin has a condition rating of 70 (VF-), indicating that it is in fairly good shape, although not the best possible condition.
3. Auction History: The coin has been auctioned once before, with a hammer price of 190 euros. This suggests that there is significant interest in this coin, especially given its condition.
4. Average Starting and Hammer Prices: The average starting price is 52.5 euros, and the average hammer price is 190 euros. This indicates that, in general, coins of this reference tend to reach higher prices at auction.

Given that the coin has a condition rating of 70 and has previously reached a hammer price of 190 euros, it is reasonable to assume that interest in this coin will remain.

Taking all these factors into account, an estimated maximum purchase price could be in a range between the previous hammer price (190 euros) and a bit more, considering that the condition is good and there is an upcoming auction.

Therefore, an estimated maximum purchase price could be approximately 200-220 euros. This would allow for competitive bidding in the auction without exceeding a reasonable limit based on the price history.

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 30 (BC+), indicating that it is not in the best condition, but it is also not among the worst.

2. Auction History:
- The average hammer price in previous auctions is 33.3 euros.
- The coin has been auctioned 33 times, of which it has sold 23 times, indicating a reasonable sell-through rate.
- Previous hammer prices for coins with similar conditions (around 30) have varied, but there are examples of auctions reaching up to 50 euros in more favorable conditions.

3. Starting Price and Estimates:
- The current starting price is 25 euros, which is a good starting point.
- The average starting price in previous auctions is 29.18 euros, suggesting that the market is willing to pay a bit more than the starting price.

4. Recent Trends: In the most recent auctions, hammer prices have ranged between 25 and 50 euros, depending on condition and demand.

Based on these factors, an estimated maximum purchase price could be around 40-45 euros. This is based on the historical hammer prices for coins of similar condition and market interest. However, given that the condition of this coin is 30, it is wise not to exceed 45 euros to avoid overpaying.

To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition rating of 75 (MBC), indicating that it is in quite good shape. This can positively influence its value.

2. Auction History:
- The average hammer price in previous auctions is 40.8 euros.
- The coin has been auctioned 11 times, of which it has sold 10 times, indicating good demand.
- Previous hammer prices for coins with similar conditions (75 and 80) have ranged between 30 and 95 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 20 euros, which is relatively low compared to the average hammer price of 40.8 euros.
- The average starting price is 35.17 euros, suggesting that the current starting price could be a good buying opportunity.

4. Price Trends:
- In previous auctions, hammer prices have varied, but there are examples of sales reaching up to 95 euros in similar conditions.

Based on these factors, an estimated maximum purchase price could be between 60 and 80 euros, considering that the condition is good and that the price history shows that similar coins have reached higher prices in the past.

Therefore, a reasonable maximum purchase price could be 75 euros.

To estimate a maximum purchase price for the coin in question, we can analyze the provided data:

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

2. Auction History:
- The coin has been auctioned 24 times, of which it has sold 17 times.
- The average hammer price in previous auctions is 15.59 euros.
- The hammer prices in previous auctions for coins with similar conditions (75) have been 14 euros (2022) and 15 euros (2020).

3. Starting Prices and Estimates:
- The current starting price is 12 euros, which is slightly below the average starting price of 12.4 euros.
- The estimated prices in previous auctions for condition 75 have been 20 euros (2022) and 25 euros (2020).

4. Trends:
- The overall trend shows that hammer prices have been in a range of 14 to 15 euros for similar conditions in recent years.

Based on this data, an estimated maximum purchase price could be between 15 and 20 euros, considering that the average hammer price is 15.59 euros and that the estimated price in previous auctions has reached up to 20 euros.

Therefore, a reasonable maximum purchase price could be 20 euros.

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

1. Starting price: 12 euros.
2. Condition: The coin has a condition rating of 25 (BC), indicating that it is not in very good shape.
3. Auction history: It has been auctioned once before, with a starting price of 12 euros and a hammer price of 12 euros, suggesting that there has not been significant interest above its starting price.
4. Average hammer price: The average hammer price is also 12 euros, reinforcing the idea that interest in this coin is limited.

Given that the condition is low and the auction history shows no price increase, the estimated maximum purchase price could be slightly above the starting price, but not much more, as interest appears to be low.

Therefore, an estimated maximum purchase price could be around 15 euros, considering there might be a slight increase in demand or interest in the current auction.