Based on the provided data, we can observe that the coin has had a starting price of 30 euros in this auction, with a conservation grade of 70 (MBC-). In previous auctions, it has been sold with starting prices of 60 euros and its value has been estimated at 90 euros.

Considering that the average closing price in previous auctions was 110 euros, and that the conservation grade of the coin is 70 (MBC-), we could estimate a maximum purchase price around 100 euros. However, keep in mind that the final price will depend on the demand in the current auction and other factors that may influence buyers' decisions.