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 suggests that its value should be above that of coins with lower conditions.

2. Previous Auction Prices: The average hammer price for similar coins has been 304.37 euros, indicating that there is a market willing to pay significantly higher prices than the starting price.

3. Price Trends: By observing previous hammer prices for coins with similar conditions (80-85), we can see that they have reached hammer prices of up to 160 euros in recent auctions.

4. Starting Price and Average Starting Price: The current starting price is 60 euros, and the average starting price for similar coins is 88.02 euros. This suggests that the starting price is reasonable, but it also indicates that there is potential for an increase in the hammer price.

5. Sales History: The coin has been sold in 96% of the auctions it has participated in, indicating high demand.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 200 euros. This is based on the historical hammer prices for coins of similar condition and the price trends in the market.

Therefore, a reasonable maximum purchase price could be 200 euros.