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 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 Prices: By looking at previous auction prices for coins with a similar condition (85), we find that in past auctions, the hammer prices have varied. For example:
- In the auction on December 16, 2020, the coin with a condition of 85 sold for 100 euros.
- In the auction on February 16, 2023, it sold for 75 euros, but the estimated price was 125 euros.

3. Average Hammer Price: The average hammer price for this coin is 80.34 euros, which can also serve as a reference.

4. Starting Price: The current starting price is 75 euros, indicating that the seller expects a minimum price of 75 euros.

5. Sales Trends: The coin has been auctioned 46 times, of which 32 have resulted in sales. This suggests that there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be between 100 and 125 euros, given that this range has been reached in previous auctions for coins with a similar condition. Therefore, a reasonable maximum purchase price could be:

Estimated maximum purchase price: 125 euros.