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

1. Current Condition: The coin has a condition rating 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. Auction History:
- The average hammer price for similar coins in the past is 39.8 euros.
- Previous hammer prices for coins with similar conditions (around 75-80) have varied, but some have reached up to 440 euros in exceptional conditions.

3. Starting Price and Estimated Price:
- The current starting price is 25 euros, and the average starting price in the past has been 21.6 euros. This suggests that the starting price is reasonable and could attract bidders.

4. Sales Trends: The coin has been sold in 60 out of the 72 previous auctions, indicating good demand.

5. Comparison with Previous Prices:
- In previous auctions, coins with a condition of 75 have had hammer prices ranging from 30 to 95 euros, depending on demand and other factors.

Based on these points, an estimated maximum purchase price for this coin could be between 50 and 70 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate. However, given the interest and demand, a price of up to 80 euros could be reasonable if the auction generates competition among bidders.