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

1. Coin Condition: The coin in question has a condition rating of 95 (S/C-), indicating that it is in very good shape. 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 51.57 euros.
- Coins with similar conditions (around 95) have sold for varying prices, but there are examples of auctions reaching up to 320 euros (in the case of an auction in 2015).

3. Starting Price and Estimates:
- The starting price for the current auction is 60 euros, which is higher than the average starting price of 33.36 euros.
- The estimated price for this auction is 60 euros, suggesting that the organizers expect considerable interest.

4. Price Trends:
- In previous auctions, coins with similar conditions have reached hammer prices exceeding 100 euros, especially in condition ratings of 95 or higher.

Based on these factors, an estimated maximum purchase price could be in the range of 100 to 150 euros, considering that the condition is high and there are precedents for high hammer prices for coins in similar conditions. However, since the starting price is 60 euros, it is possible that buyers may be willing to bid more, especially if there is interest in the coin.

Therefore, a reasonable maximum purchase price could be 120 euros.