Based on the data provided, we can observe that the coin in question has had an average auction price of 27.34 euros in previous auctions. Additionally, its current condition is 85 (ebc-).

Considering that the coin will be auctioned in the coming days with a starting price of 15 euros and has had an average starting price of 16.07 euros in the past, we can estimate that the final auction price could be around 30-35 euros.

Given that the coin has performed well in previous auctions and its condition is quite good, we could consider a maximum purchase price of around 35 euros. However, keep in mind that the final price will depend on the demand at the auction and other potential interested buyers.