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

1. Current Condition: The coin has a condition rating of 75 (MBC), 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 for coins with a similar condition (75) in the past has been approximately 60-70 euros.
- In previous auctions, coins with a condition of 75 have reached hammer prices of up to 110 euros, as seen in the auction on 2023-02-16.

3. Starting Price and Average Starting Price: The current starting price is 35 euros, which is below the average starting price of 53.39 euros. This suggests that there is potential for the hammer price to be higher.

4. Recent Trends: In the most recent auctions, the hammer price has shown a trend of being higher, especially for coins in good condition.

Based on these factors, an estimated maximum purchase price for this coin could be between 80 and 110 euros, considering that the condition is favorable and there is a history of hammer prices that supports this estimate.

Therefore, a reasonable maximum purchase price could be 100 euros.