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

1. Coin Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in relatively good shape. This suggests that its value should be above that of coins with lower conditions.

2. Previous Auction Prices: By observing the hammer prices of coins with similar conditions (around 80), we can see that the average hammer price in the past has been 204.11 euros. However, it is important to note that the hammer price can vary depending on demand and other factors.

3. Average Starting and Hammer Prices: The average starting price is 115.27 euros, and the average hammer price is 204.11 euros. This indicates that, in general, coins of this reference tend to sell for significantly higher prices than their starting price.

4. Sales Trends: The coin has been auctioned 60 times in the past, of which 55 have been sold. This suggests that there is a consistent interest in this coin, which may increase its value at auction.

5. Comparison with Previous Hammer Prices: In previous auctions, hammer prices for coins with similar conditions have varied, but some have reached up to 900 euros in exceptional cases. However, those cases are more the exception than the rule.

Taking all these factors into account, an estimated maximum purchase price for this coin could be in the range of 200 to 300 euros, considering that the average hammer price is 204.11 euros and that the coin's condition is good. A price of 250 euros could be a reasonable target, given the interest in the coin and its condition.