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

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

2. Historical Prices: By looking at previous auction prices for coins with similar conditions (95 and 90), we can see that auction prices have varied, but in general, coins in EF+ condition tend to reach higher prices. For example, in recent auctions, coins with a condition of 95 have reached hammer prices of up to 650 euros.

3. Starting Price and Average Hammer Price: The current starting price is 375 euros, and the average hammer price for this coin is 330.76 euros. However, given the high condition, it is reasonable to expect that the hammer price will be above this average.

4. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have been in the range of 400 to 650 euros. This suggests that there is solid demand for coins in this state.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 500 to 650 euros. This reflects both the high condition of the coin and the price trends observed in previous auctions.