To estimate a maximum purchase price for the coin that will be auctioned, we will consider several factors:

1. Condition of the coin: The coin in question has a condition rating of 95 (EF+), indicating that it is in very good condition. This generally translates to a higher price compared to coins with lower condition ratings.

2. Auction history:
- The average hammer price for coins with a similar condition (95) in the past has been up to 110 euros, as seen in the auction on December 16, 2021.
- In other auctions, hammer prices have varied, but the range has been between 35 and 135 euros for coins with condition ratings from 90 to 95.

3. Starting price and previous prices:
- The current starting price is 75 euros, which is slightly higher than the average starting price of 33.75 euros. This may indicate an expectation of greater interest in this auction.
- The average hammer price of 59.71 euros suggests that, although the starting price is higher, the interest may align with buyers' expectations.

4. Price trends:
- Given that the coin is in good condition and has had high hammer prices in the past, it is reasonable to consider that the hammer price could be in the upper range.

Based on these factors, an estimated maximum purchase price could be between 100 and 120 euros, considering that the condition is high and there have been precedents for hammer prices in that range. However, since the starting price is 75 euros, it is likely that the hammer price will not significantly exceed this range unless there is exceptional interest in the coin.

Therefore, a reasonable maximum purchase price could be 100 euros.