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 coin has been auctioned 64 times, of which it has sold 60 times. This indicates good demand and sustained interest in the coin.

3. Previous Prices: Previous hammer prices for coins with the same condition (95) have varied, but generally, they have been in a range of 270 to 380 euros. For example, in recent auctions, the hammer prices have been 305, 320, 360, and 380 euros.

4. Starting Price and Average Hammer Price: The current starting price is 300 euros, and the average hammer price in the past has been 254.55 euros. However, given the high condition and interest in the coin, it is reasonable to expect that the hammer price will be above this average.

5. Recent Trends: In the most recent auctions, the hammer prices have been in the range of 360 to 380 euros, suggesting that interest in the coin has increased.

Based on these factors, an estimated maximum purchase price for this coin could be between 360 and 400 euros. This reflects both the high condition and the price trend in recent auctions. Therefore, a reasonable maximum purchase price could be 380 euros.