To estimate a maximum purchase price for the coin that will be auctioned, we can consider several factors based on the provided data:

1. Coin Condition: The coin has a condition rating of 70 (MBC-), indicating that it is in relatively good shape. This can positively influence its price.

2. Starting Price: The starting price is 50 euros. This is the baseline for the auction.

3. Auction History:
- The average hammer price for similar coins is 91.88 euros.
- In the past, this coin has had hammer prices that varied, with some reaching up to 235 euros in previous auctions.

4. Price Trends:
- The coin has been auctioned 11 times, of which 10 have sold. This indicates good demand.
- The average starting price for similar coins is 58.33 euros, suggesting that the current starting price is competitive.

5. Previous Hammer Prices:
- In recent auctions, hammer prices have been 50, 75, 90, and 140 euros, showing a considerable range in which the price can fluctuate.

Taking all these factors into account, an estimated maximum purchase price could be set in a range between 90 and 120 euros, considering that the average hammer price is 91.88 euros and that the coin's condition is good.

Therefore, a reasonable maximum purchase price could be 100 euros. This allows for some margin for competition in the auction and reflects the historical value 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. Current Condition: The coin has a condition of 70 (MBC-). This indicates that it is in relatively good shape, but not of the best quality (FDC).

2. Previous Prices: Looking at previous auction prices for coins with similar conditions (70 and 75), we can see that:
- In past auctions, coins with a condition of 70 have reached hammer prices of up to 140 euros.
- Coins with a condition of 75 have reached hammer prices of up to 110 euros.

3. Average Hammer Price: The average hammer price for this coin is 184.55 euros, suggesting that, in general, coins of this reference tend to sell for higher prices.

4. Starting Price and Average Starting Price: The current starting price is 30 euros, and the average starting price is 59.78 euros. This indicates that the starting price is relatively low compared to previous hammer prices.

5. Auction Trends: Since the coin has been auctioned 23 times and all have been sold, this suggests a consistent demand.

Based on these factors, an estimated maximum purchase price could be in the range of 140 to 200 euros, considering that the condition is 70 and there are precedents for higher hammer prices. However, given that the starting price is 30 euros, it might be reasonable to set a maximum purchase price around 150-180 euros, depending on the competition in the auction and the interest of other bidders.

Therefore, an estimated maximum purchase price could be 180 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 75 (MBC), indicating that it is in quite good shape. This generally translates to a higher price compared to coins in lower condition.

2. Auction History:
- The average hammer price in previous auctions has been 70 euros.
- The coin has been auctioned 6 times, of which it has sold 5 times, indicating good demand.
- Previous hammer prices have varied, but the highest was 75 euros on several occasions.

3. Starting Price and Average Starting Price:
- The current starting price is 30 euros, which is relatively low compared to the average starting price of 50 euros and the average hammer price of 70 euros.

4. Price Trends:
- In previous auctions, hammer prices have ranged from 60 to 75 euros, with an estimated price of up to 100 euros in a previous auction.

Given that the coin's condition is 75 and considering the price history, an estimated maximum purchase price could be in the range of 70 to 90 euros. This is based on the average hammer price and the fact that the condition is good.

Therefore, a reasonable estimated maximum purchase price for this coin could be 80 euros. This allows for a margin for competition in the auction, given that the starting price is low and there is interest in the coin.

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 (VF), which indicates that it is in acceptable shape, but not among the best qualities. This can influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for similar coins is 181.63 euros.
- In the past, coins of the same reference with similar conditions have sold for prices that varied significantly, from 35 euros to 440 euros, depending on the condition and demand at that time.

3. Starting and Hammer Price:
- The current starting price is 60 euros, which is relatively low compared to the average hammer price.
- The last auction of a similar coin with a condition of 80 had a hammer price of 140 euros, suggesting there is potential for price increase.

4. Sales Trends: Of the 14 times it has been auctioned, 13 have sold, indicating good demand for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 200 euros, considering that the condition is slightly lower than that of coins that have reached higher prices in the past. This also takes into account the average hammer price and sales trend.

Therefore, a reasonable maximum purchase price could be 180 euros.

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

1. Coin Condition: The coin has a condition rating of 75 (MBC), indicating that it is in fairly good shape, but not of the highest quality (FDC).

2. Auction History:
- The average hammer price for similar coins has been 174.37 euros.
- In previous auctions, we have seen hammer prices that varied significantly, ranging from 40 euros to 750 euros, depending on the condition and demand at that time.

3. Starting Price and Previous Prices:
- The current starting price is 60 euros, which is lower than the average starting price of 72.78 euros.
- In previous auctions, the highest hammer price for coins with a similar condition has been 360 euros (in 2018).

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

Taking all these factors into account, an estimated maximum purchase price could be in the range of 150 to 200 euros. This is based on the historical hammer prices for coins of similar condition and the growing interest in recent auctions.

Therefore, a reasonable maximum purchase price could be 200 euros.

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

1. Condition: The coin has a condition of 70 (MBC-), which indicates that it is in an acceptable state, but not of the highest quality. This influences the price, as coins in better condition tend to reach higher prices.

2. Previous starting and hammer prices:
- The average starting price is 63.23 euros and the average hammer price is 97.45 euros.
- In previous auctions, the hammer price has varied considerably, with some auctions reaching up to 260 euros (in the case of a coin with a condition of 85).

3. Sales trends: The coin has been sold in 49 out of 56 auctions, indicating good demand. Additionally, the fact that it will be auctioned again soon suggests that interest in the coin remains.

4. Comparison with previous prices:
- In recent auctions, hammer prices for coins with similar conditions (70) have been around 70-120 euros.
- The last auction of a coin with a condition of 70 had a hammer price of 90 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 90 to 120 euros. This is based on current interest, the condition of the coin, and previous hammer prices. However, since the auction market can be volatile, it is advisable to keep an eye on the auction and adjust the bid according to the competition.