Based on the data provided, we can observe that the coin in question had an opening price in the current auction of 18 euros, with a grade of 70 (MBC-). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 25 and 110 euros.

The average starting price of this coin in previous auctions has been 42.2 euros, while the average closing price has been 62.67 euros. In the last recorded auction, the coin was sold for 55 euros.

Considering this data, as well as the grade of the coin and previous closing prices, we could estimate a maximum purchase price for this coin in the current auction. Given that the coin is graded at 70 (MBC-) and considering the previous closing prices, we could suggest a maximum purchase price around 70-80 euros.

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