Based on the provided data, we can observe that the coin in question has had a starting price in this auction of 12 euros, with a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 18 and 110 euros.

The average closing price of this coin has been 56.7 euros, which gives us an idea of the value that collectors are willing to pay for it. Considering that the current conservation grade is 70 (MBC-), we can assume that its condition is not the best, but it is not bad either.

Given that the average closing price is 56.7 euros and the conservation grade is 70 (MBC-), we could estimate a maximum purchase price around 60-65 euros. However, keep in mind that the final price in an auction can vary depending on demand and other factors, so it is important to pay attention during the auction to adjust your offer accordingly.