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. Auction History: By observing previous hammer prices for coins with similar conditions (95 and close), we can see that hammer prices have varied but have reached significant figures. For example, in previous auctions, coins with a condition of 95 have reached hammer prices of up to 500 euros.

3. Starting Price and Average Hammer Price: The current starting price is 300 euros, and the average hammer price in the past has been approximately 301.14 euros. This suggests that the hammer price could be in a similar range or slightly higher.

4. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have shown an increase, which could indicate an upward trend in the value of these coins.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 450 to 550 euros. This range takes into account the good condition of the coin, the history of hammer prices, and current market trends.