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 this coin is 110.85 euros.
- In previous auctions, hammer prices have varied, but there are examples of sales reaching up to 240 euros (in 2016) and 700 euros (in 2015) for coins of similar or better condition.
- Most hammer prices for coins with a condition rating of 70 to 80 have been in the range of 60 to 130 euros.

3. Starting Price and Average Starting Price: The current starting price is 50 euros, and the average starting price in the past has been 74.28 euros. This suggests that the market is willing to pay more than the starting price.

4. Recent Trends: In the most recent auctions, hammer prices have been in the range of 50 to 120 euros for coins with similar conditions.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 120 to 150 euros, considering that the condition is good and that the auction price history supports this estimate. However, it is important to keep in mind that the final price may vary depending on the competition in the auction and the interest of collectors.