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 rating of 75 (MBC), indicating that it is in quite good shape. This suggests that its value should be above the average of previous auctions.

2. Previous Auction Prices:
- The average hammer price in previous auctions is 87.07 euros.
- The last auction of this coin with a similar condition (75) had a hammer price of 130 euros in February 2022.
- In the April 2024 auction, a coin with a condition of 85 was sold for 260 euros, indicating that coins in good condition can reach high prices.

3. Starting and Hammer Prices:
- The current starting price is 40 euros, which is relatively low compared to previous hammer prices.
- The average starting price in previous auctions is 51.67 euros, suggesting that the current starting price could be attractive to buyers.

4. Sales Trends:
- Out of the 33 times it has been auctioned, it has sold on 29 occasions, indicating good demand for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 120 to 150 euros, considering that the condition is good and there are precedents of higher hammer prices in the past. This also takes into account the trend of prices in recent auctions and the overall demand for the coin.