Based on the data provided, we can observe that the coin in question has had a starting price in previous auctions ranging between 15 and 75 euros, with estimated prices between 25 and 110 euros. The average auction closing price has been 61.67 euros.

Considering that the current condition of the coin is 30 (BC+), and that in previous auctions it has been sold for prices ranging from 35 to 80 euros, we could estimate a maximum purchase price on this occasion around 80 euros.

It is important to take into account that the final auction price will depend on factors such as the demand at that specific moment, the competition from other bidders, and the interest generated by the coin in that particular auction.