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. Auction history:
- The average hammer price for similar coins in the past is 532.61 euros.
- Coins with similar condition (95) have been auctioned for hammer prices of up to 1900 euros in recent auctions.

3. Starting price: The current starting price is 500 euros, which is a good starting point, but the hammer price could be significantly higher.

4. Price trends: Observing the hammer prices of coins with similar conditions, there are examples of prices exceeding 1000 euros, suggesting that there is a market willing to pay more for coins in excellent condition.

Based on these factors, an estimated maximum purchase price could be in the range of 1200 to 1500 euros, considering that the coin is in high condition and there are precedents for high hammer prices for similar coins.

Therefore, a reasonable maximum purchase price could be 1500 euros.