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 relatively good shape. 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 86.08 euros. This suggests that, on average, similar coins have reached prices above the starting price.

3. Sales History: The coin has been auctioned 76 times, of which 48 have been successful sales. This indicates a consistent interest in the coin, which may increase its value.

4. Previous Prices: By looking at previous hammer prices for coins with similar conditions, we can see that they have reached hammer prices that vary significantly, but some have exceeded 200 euros in similar conditions.

5. Recent Trends: In the most recent auctions, hammer prices have shown an increase, which may indicate an upward trend in the value of this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 120 to 150 euros. This is based on the average hammer price and the price history of coins with similar conditions. However, given the interest and the upward trend, a maximum of 150 euros could be reasonable to secure the purchase in this auction.