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 to be auctioned has a condition of 80 (MBC+). This is an important factor, as coins in better condition tend to fetch higher prices.

2. Previous Prices: By observing the hammer prices of coins with similar conditions (around 80), we can see that they have reached varying hammer prices. For example:
- In 2019, a coin with a condition of 80 was auctioned for 25 euros.
- In 2022, a coin with a condition of 85 was auctioned for 190 euros.
- In 2021, a coin with a condition of 90 was auctioned for 230 euros.

3. Average Hammer Price: The average hammer price for this coin is 96.47 euros, indicating that, in general, coins of this reference tend to sell for relatively high prices.

4. Starting Price and Estimates: The starting price is 40 euros, and the average starting price is 53.07 euros. This suggests that the hammer price could be significantly higher than the starting price.

5. Auction Trends: Given that there have been 76 previous auctions and 69 sales, the sell-through rate is high, indicating consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 250 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate. However, since the hammer price can vary depending on demand at the time of the auction, a prudent maximum purchase price could be approximately 200 euros.