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

1. Current 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. Auction History:
- The average hammer price in previous auctions is 47.99 euros.
- The coin has been auctioned 16 times, of which it has sold 11 times, indicating good demand.
- Previous hammer prices for coins with similar conditions (85) have varied, but there are examples of hammer prices exceeding 50 euros.

3. Starting Price: The starting price is 40 euros, which is a good starting point, but given the history of hammer prices, it is likely that the final price will be higher.

4. Price Trends: In previous auctions, we have seen hammer prices reaching up to 91.65 euros for coins in similar conditions. However, there are also lower prices, suggesting that the market can be variable.

Based on these factors, an estimated maximum purchase price could be in the range of 60 to 80 euros. This is based on the history of hammer prices and the current condition of the coin. A price of 70 euros could be a reasonable target, considering it is slightly higher than the average hammer price, but still within an acceptable range for a coin in good condition.