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

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

2. Previous Auction Prices: By observing the hammer prices of coins with similar conditions, we can see that:
- A coin with a condition of 85 sold for 60 euros (2020-05-26).
- Another with a condition of 95 sold for 320 euros (2018-10-17).
- A coin with a condition of 80 sold for 40 euros (2022-03-23).

3. Average Hammer Price: The average hammer price for this coin is 94.91 euros, suggesting that, in general, coins of this reference tend to sell for higher prices.

4. Starting Price: The starting price is 40 euros, which may indicate a minimum expected price, but not necessarily the maximum price.

5. Auction Trends: Given that it has been auctioned 96 times and sold 77 times, this indicates good demand for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 100 to 150 euros, considering that the condition is good and the average hammer price is approximately 95 euros. However, since the coin has had a higher selling potential in the past, a reasonable maximum purchase price could be 120 euros.