Based on the provided data, we can observe that the coin in question has a grade of 80 (MBC+), indicating that it is in fairly good condition. Furthermore, it has been auctioned in the past on several occasions, with starting prices ranging from 15 to 80 euros.

The average starting price of this coin in previous auctions has been 26.43 euros, while the average final price has been 38.33 euros. It has been sold in 3 instances and remained unsold in 4 instances in past auctions.

Taking into consideration these data, as well as the previous prices of the coin, we could estimate a maximum purchase price around 40-45 euros. Given that the average final price has been 38.33 euros, and considering the coin's grade and past prices, a maximum purchase price of 40-45 euros could be reasonable.