Based on the provided data, we can observe that the coin in question has had a starting price of 20 euros in the current auction and is in a conservation grade of 80 (MBC+). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 10 and 200 euros.

The average closing price of this coin in the past has been 52.17 euros, with an average starting price of 34.55 euros. Considering that the current conservation grade is 80 (MBC+) and that it has reached prices of up to 200 euros in similar conditions in the past, we could estimate a maximum purchase price of around 180 euros for this coin in the current auction.

It is important to note that the final auction price will depend on various factors, such as the demand at that specific moment, the competition from other bidders, and the perceived value of the coin on that occasion. Therefore, it is advisable to pay attention to the auction and adjust the offer accordingly.