To estimate a maximum purchase price for the coin in question, we can analyze the provided data:

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

2. Previous Auction Prices:
- The average hammer price for similar coins has been 3,380.73 euros.
- In previous auctions, coins with a similar condition (95) have reached hammer prices of up to 4,800 euros (in the auction on November 11, 2021).

3. Starting Price: The current starting price is 1,800 euros, which is significantly lower than previous hammer prices.

4. Price Trends: Observing the hammer prices of coins with a condition of 95, it can be noted that prices tend to range from 3,000 to 4,800 euros, depending on demand and other market factors.

Based on these points, an estimated maximum purchase price could be set in a range between 4,000 and 4,500 euros, as this price reflects both the condition of the coin and previous hammer prices. However, it is important to consider that the final price may vary depending on competition in the auction and other market factors at the time of the auction.