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

1. Current Condition: The coin has a condition rating of 95 (EBC+), indicating that it is in very good shape. This generally translates to a higher price compared to coins in lower conditions.

2. Previous Prices: By looking at previous auction prices for coins with a similar condition (95), we can see that the hammer prices have varied but have reached figures close to 500 euros in some recent auctions. For example:
- In the auction on 2023-03-16, the hammer price was 425 euros.
- In the auction on 2022-10-19, the hammer price was 445 euros.
- In the auction on 2022-07-07, the hammer price was 400 euros.

3. Starting Price and Average Hammer Price: The current starting price is 375 euros, and the average hammer price in the past has been 321.85 euros. This suggests that the starting price is reasonable and could attract bidders.

4. Recent Trends: In the most recent auctions, hammer prices have shown an upward trend, especially for coins in good condition. This may indicate an increase in demand.

Based on these factors, an estimated maximum purchase price could be between 450 and 500 euros, considering that the coin is in good condition and that previous hammer prices have reached similar figures. Therefore, a reasonable maximum purchase price could be 500 euros.