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 Listing Price and Previous Prices: The current listing price is 60 euros, and the average hammer price in previous auctions is 163.09 euros. This suggests that the coin has a significantly higher selling potential than its listing price.

3. Auction History: In the auction history, it is noted that coins with a similar condition (80) have reached hammer prices of up to 240 euros (as seen in the auction on 2022-06-01). Additionally, the highest recorded hammer price for coins with a condition of 85 is 500 euros.

4. Price Trends: The overall trend shows that coins with a condition of 80 have had hammer prices ranging from 60 to 240 euros in the past, with an average hammer price suggesting a higher value.

5. Estimated Price: The estimated price for this auction is 90 euros, which also indicates a potential value that could be reached.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 250 euros, considering that the coin has a history of hammer prices that justifies this range and that condition is an important factor in valuation.

Therefore, a reasonable maximum purchase price could be 250 euros.