To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current 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. Current Listing Price and Previous Prices: The current listing price is 100 euros. The average hammer price in previous auctions is 126.98 euros, suggesting that similar coins have reached prices above the listing price.

3. Sales History: The coin has been auctioned 63 times, of which 57 have been successful sales. This indicates good demand and consistent interest in this reference.

4. Previous Hammer Prices: By observing the previous hammer prices for coins with similar conditions (95 or close), we can see that they have reached hammer prices that vary, but some have exceeded 200 euros in recent auctions.

5. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have been 130 euros or more, suggesting that interest and value for these coins are on the rise.

Based on these factors, an estimated maximum purchase price for this coin could be between 150 and 200 euros, considering that the average hammer price is 126.98 euros and that the condition is high. Therefore, a reasonable maximum price could be 180 euros.