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 quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Starting Price and Average Hammer Price: The current starting price is 60 euros, and the average hammer price in previous auctions is 79.71 euros. This suggests that, on average, similar coins have reached hammer prices above the starting price.

3. Price History: By looking at previous hammer prices for coins with similar conditions (around 80), we can see that they have reached hammer prices that vary, but some have reached 120 euros or more under similar conditions.

4. Sales Trends: The coin has been auctioned 68 times, of which it has sold 62 times. This indicates good demand and consistent interest in the coin, which can influence the price.

5. Comparison with Previous Prices: In previous auctions, coins with conditions of 80 have had hammer prices ranging from 75 to 120 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 90 to 120 euros, considering that the condition is good and that interest in the coin appears to be solid. A price of 100 euros could be a reasonable starting point for an offer, as it falls in the middle of this range and reflects both the condition and the price history.