Based on the provided data, we can observe that the coin in question had an opening price of 15 euros in this auction, with a grade of 25 (BC). Additionally, it has been auctioned seven times in the past, with an average starting price of 54.29 euros and an average closing price of 72.29 euros.

Analyzing the previous prices of this coin in past auctions, we can see that it has had significant variations in its starting, estimated, and closing prices. The grade of the coin in this auction is 25 (BC), indicating it is not in the best condition.

Given that the coin has had starting prices ranging from 30 euros to 125 euros in previous auctions, and considering its current grade is 25 (BC), we could estimate a maximum purchase price in this auction around 60-70 euros. It is important to consider that the final price will depend on the demand from buyers present at the auction and their interest in this particular piece.