Based on the data provided, we can see that the coin has performed well in previous auctions, with final prices exceeding the starting price. Additionally, the coin's condition is at an acceptable level (70 - MBC-).

Considering that the average starting price is 12 euros and the average final price is 25 euros, and taking into account the previous auction prices where the estimated price has been surpassed on both occasions, we could estimate a maximum purchase price of around 30 euros for this coin in the next auction.

It is important to note that the value of a coin in an auction can vary depending on factors such as demand at that specific time, competition from other bidders, and the coin's availability in the market. Therefore, it is advisable to stay alert during the auction and adjust the offer accordingly.