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

1. Current Condition: The coin has a condition of 75 (MBC), indicating that it is in fairly good shape, but not among the best qualities (FDC).

2. Auction History:
- The average hammer price for similar coins is 245.58 euros.
- In the past, coins with similar conditions (75) have been auctioned and reached hammer prices that varied, but some examples are:
- 2023-03-22: Hammer price 75 (condition 80).
- 2022-09-14: Hammer price 120 (condition 85).
- 2021-11-11: Hammer price 180 (condition 90).
- The trend shows that coins with a condition of 75 can reach hammer prices ranging from 60 to 120 euros, depending on demand and other factors.

3. Starting Price: The starting price is 25 euros, suggesting that there is considerable room for the hammer price to be significantly higher.

4. Recent Hammer Prices: In the most recent auctions, hammer prices for coins of similar condition have been between 75 and 120 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 100 and 150 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate. However, since the market can be volatile, it is advisable to keep an eye on the auction and adjust the bid according to the competition.