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

1. Current 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. Auction History:
- The average hammer price for similar coins in the past has been approximately 318.26 euros.
- In previous auctions, coins with a similar condition (95) have reached hammer prices that vary, but some have exceeded 400 euros.

3. Starting Price and Estimates:
- The current starting price is 350 euros, which is a good indicator that the seller expects a competitive price.
- The estimated price for this auction is 500 euros, suggesting that there are expectations for the coin to sell at a higher price.

4. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have been in the range of 400 to 480 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 450 and 500 euros, considering that the condition is high and there is a trend for hammer prices to exceed 400 euros in recent auctions.

Therefore, a reasonable maximum purchase price could be 500 euros.