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 80 (MBC+), indicating that it is in good condition. This generally translates to a higher price compared to coins with lower conditions.

2. Starting Price and Average Hammer Price: The starting price is 60 euros, and the average hammer price in previous auctions is 72.41 euros. This suggests that, on average, similar coins have reached prices above the starting price.

3. Sales History: The coin has been auctioned 36 times, of which it has sold 27 times. This indicates good demand and a history of successful sales.

4. Previous Prices: By looking at previous hammer prices for coins with similar conditions (80 and 75), we can see that they have reached hammer prices of up to 90 euros on some occasions.

5. Recent Trends: In the most recent auctions, hammer prices have been in the range of 60 to 90 euros for similar conditions.

Based on these factors, an estimated maximum purchase price could be in the range of 90 to 100 euros, considering that the condition is good and the sales history supports a higher price. Therefore, a reasonable maximum purchase price could be 100 euros.