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 (EBC+), 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 440 euros in recent sales.

3. Price Trends: The average auction price for coins of similar condition has been approximately 400 euros in the most recent auctions. This suggests that the market is willing to pay prices in that range.

4. Starting Price: The starting price of 425 euros is a good indicator of what is expected to be obtained at the auction. However, the starting price does not always reflect the final auction price.

5. Sales History: The coin has been auctioned 135 times, with a high sales percentage (125 out of 135). This indicates a consistent demand, which can influence the price.

Based on these factors, an estimated maximum purchase price for this coin could be between 450 and 480 euros, considering that the market has shown a willingness to pay prices in that range for coins of similar condition and that the coin in question is in excellent condition.