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

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 in lower conditions.

2. Auction history:
- The average hammer price for similar coins is 77.7 euros.
- In previous auctions, hammer prices have varied, but there are examples of coins in similar condition that have sold for 220 euros (in 2020) and 201 euros (in 2018).

3. Starting price: The starting price is 40 euros, which is relatively low compared to previous hammer prices.

4. Supply and demand: The coin has been auctioned 25 times, of which it has sold 20 times. This suggests there is consistent interest in this coin, which may increase its value.

Taking these factors into account, an estimated maximum purchase price could be in the range of 150 to 220 euros, given that the auction price history for coins in similar conditions has reached those levels. However, to be more conservative and considering the starting price, a reasonable maximum purchase price could be approximately 150 euros.