Based on the data provided, we can observe that the coin in question has had an average auction closing price of 23.85 euros in previous auctions. Additionally, its condition is described as '70 (MBC-)', indicating that it is in a fairly acceptable condition.

Taking into account the previous prices of this coin and its evolution in past auctions, as well as its current condition, we can estimate a maximum purchase price around 40-45 euros. Considering that the average auction closing price has been 23.85 euros and there have been previous auctions where a price of up to 50 euros was reached, considering a range of 40-45 euros as the maximum purchase price seems reasonable.

It is important to note that the final price in an auction can vary depending on factors such as the demand at that specific moment, the competition from other bidders, and the subjective perception of the coin's value by potential buyers.