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

1. Condition of the coin: The coin to be auctioned 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 with lower conditions.

2. Previous auction prices: By looking at the hammer prices of coins with similar conditions (around 95), we can see that the hammer prices have varied, but there are recent examples showing hammer prices of up to 440 euros.

3. Starting price and average hammer price: The starting price is 375 euros, and the average hammer price in previous auctions is 297.25 euros. However, given that the condition of this coin is high, it is reasonable to expect that the hammer price will be above the average.

4. Recent trends: In the most recent auctions, hammer prices for coins of similar condition have been in the range of 400 to 450 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 440 and 480 euros, considering that collector interest and the quality of the coin may lead to a higher hammer price. Therefore, a reasonable maximum purchase price could be 450 euros.