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

1. Current 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. Auction History:
- The average hammer price for similar coins in the past is 313.29 euros.
- The last auction of a coin with a similar condition (95) had a hammer price of 2200 euros, suggesting that there is a market willing to pay high prices for coins in excellent condition.

3. Starting Price: The starting price of 1500 euros is an indicator of what the seller expects to obtain, but it does not necessarily reflect the actual market value.

4. Price Trends: By observing previous hammer prices, there is a trend for coins in good condition (such as those with condition ratings of 90 and 95) to sell for over 300 euros, and in some cases, much more.

Given that the coin has a high condition rating and considering the auction price history, an estimated maximum purchase price could be in the range of 1800 to 2200 euros, depending on the demand at the auction and the competition among bidders.

Therefore, a reasonable estimated maximum purchase price could be 2000 euros.