To estimate a maximum purchase price for the coin in question, we can analyze 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 in lower conditions.

2. Auction History:
- The average hammer price for this coin has been 389 euros.
- In previous auctions, hammer prices have varied, but there are examples of sales that have reached up to 730 euros (in 2019 with a condition of 95).
- The last auction with a condition of 95 had a hammer price of 460 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 350 euros, which is slightly higher than the average starting price of 290.31 euros. This may indicate an expectation of greater interest in this auction.

4. Sales Trends: Of the 16 times it has been auctioned, it has sold on 14 occasions, suggesting there is consistent interest in this coin.

Based on these factors, especially considering the good condition and the auction price history, an estimated maximum purchase price could be in the range of 450 to 500 euros. This aligns with previous hammer prices and the current condition of the coin.

Therefore, an estimated maximum purchase price could be approximately 500 euros.