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. Current Starting Price and Previous Prices: The current starting price is 75 euros. In previous auctions, the average hammer price has been 155.08 euros, suggesting that buyers are willing to pay significantly more than the starting price.

3. Sales History: The coin has been auctioned 60 times, of which it has sold 56 times. This indicates high demand and a good sales record, which can influence the price.

4. Previous Hammer Prices: Looking at previous hammer prices for coins with similar conditions (80-85), we can see that they have reached hammer prices of up to 150-175 euros on some occasions.

5. Recent Trends: In the most recent auctions, hammer prices have been quite high, suggesting that interest in this coin is increasing.

Based on these factors, an estimated maximum purchase price could be between 150 and 175 euros, considering that the condition is good and that the sales history supports a higher price. Therefore, a reasonable maximum purchase price could be 160 euros.