Based on the data provided, we can see that the coin in question has had a starting price in the current auction of 25 euros and is in a conservation grade of 70 (MBC-). Additionally, it has been auctioned 19 times in the past, with an average starting price of 40.06 euros and an average closing price of 89.06 euros.

When analyzing the previous prices of this coin, we can observe significant variations in its starting, estimated, and closing prices throughout the previous auctions. However, overall, the closing price tends to be higher than the starting and estimated prices.

Given that the conservation grade of the coin is 70 (MBC-), and considering that in previous auctions it has reached closing prices above 60 euros, we could estimate a maximum purchase price around 70-80 euros for this coin in the current auction. It is important to note that the final price will depend on the demand in the auction and other factors that may influence buyers' decisions.