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

1. Coin Condition: The coin in question has a condition of 95 (S/C-), which indicates that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Auction Prices: By observing the hammer prices of coins with similar conditions (95) in previous auctions, we can see that:
- In 2023, a coin with a condition of 95 was sold for 150 euros.
- In 2021, another coin with a condition of 95 was sold for 190 euros.
- In 2014, a coin with a condition of 95 was sold for 190 euros.

3. Starting Price and Average Prices: The starting price of the current auction is 90 euros, and the average hammer price in previous auctions is 60.34 euros. However, given that the coin's condition is high, it is reasonable to expect that the hammer price will be above the average.

4. Sales Trends: The coin has been auctioned 75 times, of which it has sold 65 times. This indicates good demand and a history of successful sales.

Based on these factors, an estimated maximum purchase price could be between 150 and 200 euros, considering that the condition is high and there are precedents for sales in that range. Therefore, a reasonable maximum purchase price could be 180 euros.