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 80 (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 has been 25.62 euros.
- The coin has been auctioned 24 times, of which it has sold 14 times. This suggests there is moderate interest in the coin.
- In previous auctions, hammer prices for coins with a similar condition (80) have reached up to 60 euros.

3. Starting Price and Estimates:
- The current starting price is 40 euros, which is higher than the average starting price of 21.35 euros, indicating an expectation of greater interest or value in this auction.
- The estimated price for this auction is 40 euros, which also suggests that the auctioneers expect good interest.

4. Price Trends: In previous auctions, hammer prices for coins with a condition of 80 have varied, but the highest recorded price was 60 euros.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 60 euros, as this is a price that has been reached in the past for coins in similar conditions and reflects reasonable interest in the current auction.