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), which indicates that it is in quite good shape. This generally translates to a higher price compared to coins in lower condition.

2. Historical Prices: By looking at previous auction prices, we can see that the coin has reached auction prices of up to 3400 euros in exceptional conditions (such as in the auction on 2022-03-17). However, the auction prices closer to the current condition (75) are more relevant. For example, in the auction on 2022-11-16, the hammer price was 40 euros, and in the auction on 2022-03-10, it was 55 euros.

3. Average Hammer Price: The average hammer price for this coin is 485.32 euros, suggesting that, in general, buyers are willing to pay a considerable amount for it.

4. Starting Price and Average Starting Price: The current starting price is 40 euros, and the average starting price is 125.14 euros. This indicates that the starting price is relatively low compared to what has been paid in the past.

5. Auction Trends: Given that there are 2 auctions scheduled in the coming days and that the coin has had a good sell-through rate (28 out of 30 auctions), this may increase competition and, therefore, the price.

Taking all these factors into account, an estimated maximum purchase price for the coin could be in the range of 200 to 300 euros, considering that the condition is good and there is historical interest in the coin. However, if strong competition arises in the auction, the price could exceed this range.