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 in lower condition.

2. Starting price and previous prices: The current starting price is 2500 euros. In the past, this coin has had auction prices that varied significantly, but some of the highest prices reached are noteworthy. For example, in a previous auction, it sold for 1600 euros with a starting price of 600 euros, and in another, it reached 2000 euros.

3. Price trends: The average hammer price in previous auctions is 292.63 euros, but this includes coins of lower condition. Given that the condition of this coin is high, it is reasonable to expect that the hammer price will be significantly higher.

4. Demand and supply: The coin has been auctioned 34 times, with a sell-through rate of 91.2% (31 out of 34). This suggests that there is consistent interest in this coin, which may increase its value at auction.

5. Comparison with estimated prices: In previous auctions, estimated prices have varied, but some have reached up to 1600 euros. Given that the condition of this coin is superior, it is reasonable to expect that the hammer price will be in a higher range.

Taking all these factors into account, an estimated maximum purchase price for this coin could be between 2000 and 2500 euros. This is based on the high condition, historical demand, and previous hammer prices. However, the starting price of 2500 euros also suggests that the seller has high expectations, so it is important to be prepared for potential competition at the auction.