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

1. Coin Condition: The coin has a condition rating of 95 (EBC+), indicating that it is in very good shape. This generally translates to a higher value compared to coins with lower conditions.

2. Starting Price: The starting price is 300 euros. This is a good starting point, but not necessarily the final price.

3. Auction History:
- The average hammer price for similar coins in the past is 75.57 euros, but this may not reflect the value of a coin in such good condition.
- In previous auctions, coins with similar condition (95) have reached significantly higher hammer prices. For example, in 2019, a coin with a condition of 95 was auctioned with a starting price of 300 euros and reached a hammer price of 220 euros.

4. Recent Trends: In the most recent auctions, hammer prices for high-condition coins have shown an increase, suggesting that the market is willing to pay more for coins in excellent condition.

5. Comparison with Previous Prices: Looking at the hammer prices of coins with a condition of 90 to 95, prices have ranged from 150 to 600 euros, depending on demand and rarity.

Based on these factors, an estimated maximum purchase price for this coin could be between 400 and 600 euros, considering its high condition and market interest. However, since the starting price is 300 euros, it is likely that the final hammer price will be closer to this upper range, especially if there is interest in the auction.