Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 12 euros, with a conservation grade of 80 (MBC+). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 12 and 110 euros.

The average closing price of this coin in previous auctions has been 50.37 euros, with an average starting price of 38.53 euros. We can also see that it has had estimated prices ranging from 12 to 300 euros, depending on the auction date and conservation conditions.

Given that the current conservation grade of the coin is 80 (MBC+), and considering the previous closing prices as well as the average closing price, we could estimate a maximum purchase price of around 100 euros for this coin in the current auction. It is important to note that the final price may vary depending on the demand at the auction and other factors that may influence buyers' decisions.