Based on the data provided, we can observe that the coin in question has had varying starting and final prices in previous auctions, as well as different price estimates. The current condition of the coin is estimated at 30 (BC+).

Taking into account the previous prices of the coin in past auctions, as well as its current condition, we can attempt to estimate a maximum purchase price. Since the current starting price is 12 euros and the average final price in previous auctions has been 58.22 euros, we could consider an estimated price range for this auction.

Considering that the coin has been sold in the past at prices ranging from 12 euros to 110 euros, and taking into account its current condition, we could suggest an estimated maximum purchase price in the range of 40 to 70 euros.

It is important to note that the final auction price will depend on several factors, such as demand at the time of the auction, competition from other bidders, and buyers' perception of the coin's value at that specific moment. Therefore, it is advisable to pay close attention to the auction and adjust the offer accordingly.