To estimate a maximum purchase price for the coin in question, we can 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 price compared to coins with lower conditions.

2. Auction History: By looking at previous hammer prices for coins with a similar condition (95), we find that they have sold for prices that vary considerably in the past. For example:
- In 2018, a coin with a condition of 95 was auctioned for 650 euros.
- In 2021, another coin with the same condition was auctioned for 1000 euros.

3. Average Hammer Price: The average hammer price for this coin is 164.88 euros, but this may be influenced by coins of lower condition.

4. Starting Price: The current starting price is 300 euros, indicating that the seller expects a minimum price of 300 euros.

5. Price Trends: In previous auctions, we have seen that prices can be significantly higher than the starting price, especially for coins in good condition.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 800 to 1200 euros, considering that there are precedents of previous auctions in this range for coins of similar condition. However, the final price will depend on the competition in the auction and the interest of collectors.