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. Previous Auction Prices: By looking at previous auction prices for coins with a similar condition (95), we can see that they have reached auction prices of up to 480 euros in recent auctions. For example, at the auction on January 31, 2023, a coin with a condition of 95 was sold for 480 euros.

3. Starting Price and Average Auction Price: The current starting price is 350 euros, and the average auction price for this coin is 322.21 euros. This suggests that the starting price is reasonable and that there is potential for the final price to be higher.

4. Recent Trends: In the most recent auctions, the final prices for coins of similar condition have shown an upward trend, reaching up to 480 euros.

Based on these factors, an estimated maximum purchase price for this coin could be around 480-500 euros, given that this price has been reached in recent auctions for coins of similar condition and considering the good condition of the coin in question.