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

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

2. Previous Prices: By looking at the hammer prices of coins with a similar condition (85), we can see that they have reached hammer prices of up to 260 euros in previous auctions. For example, in a 2020 auction, a coin with a condition of 85 was sold for 120 euros.

3. Average Hammer Price: The average hammer price for this coin is 98.02 euros, which is also an important indicator.

4. Starting Price: The starting price of 60 euros is relatively low compared to previous hammer prices, suggesting that there could be a good buying opportunity.

5. Market Trends: Since the coin has been auctioned 209 times and has had a good sales percentage (171 out of 209), this indicates a consistent interest in the coin, which may influence its price.

Taking all these factors into account, an estimated maximum purchase price for this coin could be between 150 and 200 euros. This is based on the potential hammer prices of similar coins and the condition of the coin in question. However, it is important to consider that the final price may vary depending on the competition in the auction and other market factors at the time of sale.