To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Condition: The coin has a condition rating of 85 (MS+/EF-), indicating that it is in quite good shape. This generally translates to a higher price compared to coins of lower quality.

2. Previous Prices: By looking at the hammer prices of coins with similar conditions (85 and 90), we can see that the hammer prices have varied considerably. For example, in previous auctions, coins with a condition of 85 have reached hammer prices of up to 320 euros.

3. Average Hammer Price: The average hammer price for this coin is 130.15 euros, providing a solid basis for estimating the maximum price.

4. Auction Trends: The coin has been auctioned 160 times in the past, with an 89.4% sell-through rate, indicating consistent demand. Additionally, the average starting price is 81.32 euros, suggesting that buyers are often willing to pay more than the starting price.

5. Recent Starting and Hammer Prices: The current starting price is 60 euros, which is relatively low compared to previous hammer prices. This could indicate an opportunity for buyers.

Considering all these factors, an estimated maximum purchase price for this coin could be between 200 and 300 euros, taking into account that the condition is good and there is a trend of increasing prices in recent auctions. However, since the starting price is 60 euros, it is possible that buyers could acquire it for a price below this range, depending on the competition in the auction.