Based on the data provided, we can observe that the coin in question has had a starting price in the current auction of 12 euros and is in a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past on several occasions, with starting prices ranging from 10 to 60 euros.

The average starting price of the coin in previous auctions has been 24.62 euros, while the average final price has been 23.73 euros. As for the conservation grades of coins auctioned in the past, they have ranged from 30 to 80.

Given that the coin is in a conservation grade of 70 (MBC-), and considering the starting and final prices of previous auctions, as well as the estimated price trends, we could estimate a maximum purchase price of around 35-40 euros for this coin in the current auction. It is important to note that this is just an estimate and the final price may vary depending on demand and other factors in the auction.