Based on the provided data, we can observe that the coin in question had an opening price of 18 euros in the current auction, with a conservation grade of 80 (MBC+). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 40 and 180 euros.

The average closing price of this coin in previous auctions has been 97.27 euros, with an average opening price of 57.43 euros. In the last recorded auction, the coin was sold for 90 euros, surpassing the estimated price of 60 euros.

Taking into consideration these data points, as well as the coin's conservation and price history, we could estimate a maximum purchase price around 120 euros. It is important to note that this is just an estimate and the final price in an auction can vary depending on various factors such as demand at that specific moment.