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 75 (MBC), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Starting Price and Average Hammer Price: The starting price is 60 euros, and the average hammer price in previous auctions is 85.45 euros. This suggests that, on average, similar coins have reached prices above the starting price.

3. Sales History: The coin has been auctioned 96 times, of which 91 have been successful sales. This indicates good demand and consistent interest in this reference.

4. Previous Prices: By looking at previous hammer prices for coins with similar conditions (75 and 80), we can see that they have reached hammer prices that vary, but some have reached up to 130 euros (in the case of a condition of 85).

5. Recent Trends: In the most recent auctions, hammer prices have shown an increase, which could indicate an upward trend in the value of this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 100 to 130 euros, considering that the condition is good and that interest in the coin seems to be strong. Therefore, a reasonable maximum purchase price could be 120 euros.