Based on the provided data, we know that the coin is in a condition of 70 (MBC-), has been auctioned once in the past, and was sold on that occasion. The average starting price in that auction was 60 euros, and the average final price was 220 euros.

Given that the coin is in an acceptable condition and has performed well in previous auctions, we could expect its final price in a new auction to be similar or even higher. However, keep in mind that the final price may vary depending on factors such as demand at the time of the auction and the presence of potential interested buyers.

Taking these factors into consideration, and considering the previous average final price of 220 euros, we could estimate a maximum purchase price for this coin at around 250-270 euros. This price range could be seen as a prudent estimate for a potential bid in an upcoming auction.