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

1. 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. Previous Prices: By looking at previous auction prices for coins with a similar condition (95), we can see that auction prices have varied but have reached figures close to 400 euros on several occasions.

3. Average Auction Price: The average auction price for this coin is 310.78 euros, providing a solid basis for estimating the price.

4. Starting Price: The current starting price is 350 euros, suggesting that the seller has expectations of a relatively high auction price.

5. Recent Trends: In the most recent auctions, the hammer prices for coins of similar condition have been in the range of 400 to 500 euros.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 450 euros. This price reflects both the good condition of the coin and recent market trends.