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

1. Current 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. Previous Auction Prices: By looking at previous auction prices for coins with a similar condition (95), we can see that they have reached auction prices of up to 500 euros in recent sales.

3. Price Trends: The average auction price for coins of similar condition has been around 400-450 euros in the most recent auctions.

4. Current Starting Price: The starting price of 375 euros is a good indicator of the seller's expectations, but the final auction price could be significantly higher depending on demand.

5. Sales History: The coin has been auctioned 135 times, with a high sales percentage (125 out of 135). This suggests there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price for this coin could be between 450 and 500 euros, given that the condition is high and there is a history of auction prices that supports this estimate.

Therefore, a reasonable maximum purchase price could be 500 euros.