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

1. Condition: The coin has a condition rating of 95 (EF+), indicating that it is in very 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 45.7 euros.
- In previous auctions, hammer prices for coins with similar condition (95) have ranged between 45 and 66 euros.
- The last auction with a condition of 95 had a hammer price of 60 euros.

3. Starting Price and Estimated Prices:
- The current starting price is 25 euros, which is relatively low compared to previous hammer prices.
- The average starting price has been 30.77 euros, and the average estimated price has been 50 euros.

4. Sales Trends: The coin has been sold in 11 out of 14 auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 60 to 70 euros, considering that the condition is high and previous hammer prices have been in that range. Therefore, a reasonable maximum purchase price could be 70 euros.