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 in previous auctions is 33.47 euros.
- Starting prices have varied, with some hammer prices in similar conditions (75 and 80) reaching up to 59.78 euros in the past.

3. Price Trends:
- In previous auctions, starting prices have ranged from 12.12 euros to 78.93 euros, but the most relevant hammer prices for similar conditions have been in the range of 20 to 59.78 euros.

4. Current Starting Price: The starting price is 15 euros, suggesting that there is room for the hammer price to be significantly higher.

5. Sale Expectations: Given that there have been 19 previous auctions and 9 sales, there is moderate interest in this coin, which may influence competition during the auction.

Based on these factors, an estimated maximum purchase price could be in the range of 50 to 60 euros, considering that the condition is good and there is a history of hammer prices in that range for similar conditions. However, given the starting price of 15 euros, it is possible that the actual hammer price may be lower, but this range provides a reasonable target for an interested buyer.

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

1. Coin Condition: The coin has a condition rating of 90 (EBC), 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: By looking at previous hammer prices for coins with similar conditions (90 and 95), we can see that the hammer prices have varied. For example, in recent auctions, coins with a condition of 90 have reached hammer prices ranging from 12 to 35 euros.

3. Average Hammer Price: The average hammer price for this coin is 27.36 euros, which gives us a good reference point.

4. Recent Trends: In the most recent auctions, hammer prices for coins with a condition of 90 have been in the range of 20 to 35 euros.

5. Starting Price and Estimated Prices: The starting price is 12 euros, and the average starting price is 16.14 euros. However, given that the condition is good, it is reasonable to expect that the hammer price will be above these values.

Based on these factors, an estimated maximum purchase price for the coin could be in the range of 35 to 45 euros. This is based on the historical hammer prices for coins of similar condition and the potential interest in the auction.

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 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.