Based on the data provided, we can observe that the coin in question has had a starting price in the current auction of 25 euros, with a conservation grade of 30 (BC+). Additionally, it has been auctioned in the past on several occasions, with varying starting and final prices.

The average starting price of this coin in previous auctions has been 70.25 euros, while the average final price has been 121.65 euros. Regarding the conservation grades of coins auctioned in the past, they have ranged between 75 and 95.

Given that the coin has been sold in 85% of the occasions it has been auctioned in the past, and considering the previous auction prices as well as the current conservation grade of the coin, we could estimate a maximum purchase price around 110-130 euros.

It is important to note that the final auction price may vary depending on factors such as demand at the time of the auction, competition from other bidders, and the particular interest that this specific coin may generate.