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

1. Current Condition: The coin has a condition of 75 (MBC), indicating that it is in an acceptable state, but not of the highest quality.

2. Auction History:
- The average starting price of similar coins is 126.51 euros, and the average hammer price is 158.71 euros.
- In the past, coins with a similar condition (75) have been auctioned at prices that varied, but there are examples of hammer prices reaching up to 107.89 euros.

3. Price Trends:
- The coin has had a hammer price of 25 euros in an auction with a condition of 75, but it has also reached higher prices in other auctions with similar conditions.

4. Current Starting Price: The starting price is 60 euros, which may indicate a lower hammer price, but it could also attract more bidders.

Taking these factors into account, an estimated maximum purchase price could be in the range of 100 to 130 euros, considering that the condition is 75 and that the price history shows significant variations. A hammer price around 120 euros could be a reasonable target, given the context of previous auctions and the state of the coin.