Based on the data provided, we can observe that the coin in question has had a starting price in this auction of 12 euros and is in a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past 16 times, out of which it has been sold 15 times and not sold once.

The average starting price of previous auctions has been 25.13 euros, while the average final price has been 43.8 euros. Regarding the previous prices of this coin, we can see that it has had variations in its starting, estimated, and final prices throughout previous auctions.

Given that the conservation grade of the coin is 70 (MBC-) and considering the previous prices of past auctions as well as the average final price, we could estimate a maximum purchase price for this coin at around 40-45 euros. It is important to note that this is just an estimate and the final price may vary depending on the demand in the current auction.