Based on the provided data, we can see that the coin in question has a conservation grade of 80 (MBC+), with a starting price in the current auction of 25 euros. Additionally, it has been auctioned in the past three times, being sold once and not sold in the other two instances.

The average starting price in previous auctions has been 37.3 euros, while the average final price has been 60 euros. The conservation grades in the previous auctions were 75 and 90, with estimated prices of 45.51 and 88.58 euros respectively.

Considering that the coin is in a conservation grade of 80 (MBC+), and taking into account the previous prices of similar auctions as well as the current starting price, we could estimate a maximum purchase price around 50-55 euros. It is important to consider that the final price will depend on the demand in the current auction and the willingness of buyers to bid on this particular coin.