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

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

2. Starting price and previous prices: The current starting price is 1500 euros. In previous auctions, the average hammer price has been 1366.78 euros, suggesting that the current starting price is reasonable. However, there are also examples of higher hammer prices, such as 3000 euros in a recent auction.

3. Price trends: Looking at the hammer prices from previous auctions, there is a trend for high-condition coins (like this one) to sell for prices above their starting price. For example, in past auctions, coins with similar conditions have reached hammer prices of up to 3800 euros.

4. Supply and demand: Since this coin has been auctioned 60 times and has sold 56 times, there is good demand for this reference, which may drive up the hammer price.

Taking all these factors into account, an estimated maximum purchase price could be between 2000 and 2500 euros, considering that the condition is high and there are precedents for higher hammer prices in the past. This also allows for some margin for competition in the auction.