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. Previous Auction Prices: By observing the hammer prices of coins with similar conditions (around 95), we can see that the hammer prices have varied. For example, in previous auctions, coins with a condition of 95 have reached hammer prices of up to 300 euros.

3. Average Hammer Price: The average hammer price of similar coins is 101.73 euros, which provides a reference point.

4. Starting Price: The starting price of 110 euros is an indicator of the seller's expectations, but it does not necessarily reflect the final hammer price.

5. Sales Trends: The coin has been sold in 42 out of 50 auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 250 to 300 euros, considering that the condition is high and there are precedents for hammer prices in that range for coins of similar condition.

Therefore, an estimated maximum purchase price could be approximately 280 euros.