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

1. Current 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 this coin in the past is 41.25 euros.
- In previous auctions, hammer prices have varied, with a maximum price of 150 euros in an auction in 2020 for a coin with a condition of 100.
- The last auction where this coin was sold had a hammer price of 55 euros, indicating that interest in the coin remains.

3. Starting Price and Average Starting Price:
- The current starting price is 18 euros, and the average starting price in the past is 20.82 euros. This suggests that the current starting price is reasonable and could attract bidders.

4. Sales Trends: Of the 17 times it has been auctioned, it has sold 13 times, indicating a good sales rate and demand.

Based on these factors, an estimated maximum purchase price could be in the range of 70 to 90 euros, considering that the condition is high and that interest in the coin seems to be maintained. A price of 90 euros could be a reasonable target, given that a hammer price of 150 euros has been reached in the past for a higher condition.