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

1. Condition: The coin has a condition rating of 95 (EF+), indicating that it is in very good shape. This generally increases its value compared to coins with lower conditions.

2. Auction History:
- The average hammer price for similar coins in the past has been 41.64 euros.
- In previous auctions, hammer prices have reached up to 110 euros, although this can depend on the condition and demand at that time.

3. Starting Price and Estimates:
- The current starting price is 25 euros, and the average starting price in the past has been 20.58 euros.
- The estimated price for this auction is 40 euros, suggesting that bidders may be willing to pay more than the starting price.

4. Sales Trends: Of the 20 times it has been auctioned in the past, 16 have resulted in sales, indicating a consistent interest in this coin.

Taking all these factors into account, an estimated maximum purchase price could be around 70-80 euros. This is based on the auction price history and the good condition of the coin, which suggests it could attract bidders willing to pay a higher price.