To estimate a maximum purchase price for the coin in question, we will consider 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 has been 63.51 euros.
- In previous auctions, coins with a similar condition (75) have reached hammer prices of up to 70 euros.
- The last auction of a coin with a condition of 75 had a hammer price of 70 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 25 euros, which is quite low compared to the average hammer price.
- The average starting price of 36.43 euros also suggests that there is potential for an increase in the hammer price.

4. Recent Trends: Recent auctions have shown increasing interest, with hammer prices often exceeding the starting price.

Based on these factors, an estimated maximum purchase price for this coin could be between 70 and 80 euros, considering that interest in coins in good condition tends to be high and that the price history supports this estimate.