To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Coin Condition: The coin has a condition rating of 85 (ebc-), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Auction Prices: By looking at previous auction prices for coins with a similar condition (85), we can see that they have reached auction prices of up to 220 euros in recent auctions. However, most auction prices for conditions between 80-85 range from 60 to 110 euros.

3. Average Auction Price: The average auction price for this coin is 101.29 euros, which can also serve as a reference.

4. Auction Trends: The coin has been auctioned 177 times, with an 87% sell-through rate, indicating good demand in the market.

5. Starting Price: The starting price is 60 euros, suggesting that the seller expects a reasonable price for the coin.

Based on these factors, an estimated maximum purchase price could be in the range of 120 to 150 euros, considering that the condition is good and there are precedents for higher auction prices in the past. However, since the starting price is 60 euros, it is likely that the final auction price will not significantly exceed this range.

Therefore, a reasonable maximum purchase price could be 150 euros.