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. Auction History:
- The average hammer price for similar coins in the past has been 327.23 euros.
- In previous auctions, coins with a similar condition (95) have reached hammer prices of up to 440 euros (in the auction on January 18, 2023) and 420 euros (in the auction on March 16, 2023).
- The highest estimated price in previous auctions for coins with a condition of 95 has been 500 euros.

3. Starting Price: The current starting price is 350 euros, which is a reasonable starting point.

4. Price Trends: Observing the trends, it seems that coins with a condition of 95 tend to sell in a range of 380 to 440 euros in recent auctions.

Based on these factors, an estimated maximum purchase price for this coin could be between 440 and 500 euros, considering that the condition is excellent and there is a price history that supports this estimate.

Therefore, a reasonable maximum purchase price could be 450 euros.