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). This is an important factor, as coins in better condition tend to reach higher prices.

2. Previous Auction Prices: By observing the previous auction prices of coins with similar conditions, we can see that the average auction price for coins in conditions close to 75 has varied. For example, in previous auctions, coins with conditions ranging from 75 to 80 have reached hammer prices between 50 and 120 euros.

3. Average Hammer Price: The average hammer price for this coin is 111.28 euros, indicating that, in general, buyers are willing to pay around this amount.

4. Recent Trends: In the most recent auctions, the hammer price has shown an upward trend, especially for coins in similar condition.

5. Starting Price: The starting price is 40 euros, suggesting that there is considerable room for the hammer price to be higher.

Based on these factors, an estimated maximum purchase price for this coin could be between 120 and 150 euros, considering that the condition is good and there is market interest in coins of this quality. However, it is important to keep in mind that the final price may vary depending on the competition in the auction and the specific demand at that time.