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 condition ratings.

2. Auction History: By looking at previous hammer prices for coins with a similar condition (95), we can see that they have reached hammer prices of up to 650 euros in the past (as seen in the auction on December 16, 2021).

3. Starting Price and Average Hammer Price: The current starting price is 700 euros, and the average hammer price for this coin in the past has been 116.27 euros. However, since the starting price is significantly higher, this suggests that the seller has high expectations.

4. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have shown a range that can be quite high, especially for coins in condition 95.

Based on these factors, an estimated maximum purchase price could be in the range of 600 to 750 euros, considering that the starting price is 700 euros and that the condition is very favorable. However, since the starting price is high, it is possible that buyers may be willing to pay a bit more if demand is strong.

Therefore, a reasonable maximum purchase price could be 750 euros.