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 75 (MBC), indicating that it is in fairly good shape, but not of the highest quality (FDC).

2. Auction History:
- The average hammer price for similar coins in the past is 44.08 euros.
- Coins with a similar condition (75) have been auctioned for hammer prices of up to 160 euros (in the case of a condition of 80).
- The majority of coins with a condition of 75 have had hammer prices ranging from 20 to 50 euros.

3. Starting Price: The starting price is 25 euros, which may be a good indicator of the expected sale.

4. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have shown a range that can reach up to 50-70 euros, depending on demand and other factors.

Based on these points, an estimated maximum purchase price for this coin could be between 50 and 70 euros, considering that the condition is good and there is a price history that supports this estimate. However, since the market can be volatile, it is advisable not to exceed 70 euros to avoid overpaying.