To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Coin Condition: The coin to be auctioned has a condition rating of 95 (EBC+), indicating that it is in very good condition. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price for similar coins in the past is 91.9 euros.
- In previous auctions, coins with a similar condition (95) have reached hammer prices of up to 160 euros (as seen in the auction on 2024-01-18).

3. Starting Price and Previous Prices:
- The current starting price is 60 euros, which is reasonable given the history of starting and hammer prices.
- In previous auctions, the hammer price has varied, but there are examples where coins with similar conditions have reached significantly higher hammer prices.

4. Sales Trends: The coin has been sold in 77.5% of the auctions it has participated in, suggesting good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 120 to 160 euros, considering that the condition is high and there are precedents for hammer prices in that range.

Therefore, a reasonable estimated maximum purchase price could be 150 euros.