Based on the data provided, we can observe that the coin in question had a starting price in the current auction of 12 euros, with a conservation grade of 70 (MBC-). Additionally, it has been auctioned a total of 18 times in the past, with an average starting price of 33.83 euros and an average closing price of 55.72 euros.

When analyzing the previous prices of this coin in past auctions, we can see that it has had significant variations in its starting, estimated, and closing values. For example, in the auction of 2019-03-14, it had a starting price of 175 euros, an estimated price of 250 euros, and a closing price of 180 euros, with a conservation grade of 95.

Considering these data and the price evolution in previous auctions, as well as the current conservation grade of the coin, we could estimate a maximum purchase price around 60-70 euros. It is important to note that the final price may vary depending on factors such as demand in the current auction and competition from other bidders.