Based on the data provided, we can observe that the coin in question has had an average starting price of 10.94 euros in previous auctions, with a median closing price of 17.43 euros. Additionally, the condition of this coin has been classified as 100 (UNC), indicating that it is in excellent condition.

Considering the previous prices of this coin in past auctions, as well as the fact that it will be auctioned in the upcoming days, we can estimate a maximum purchase price. Since the highest closing price was 40 euros in a recent auction, and taking into account the exceptional condition of the coin, we could consider an estimated maximum purchase price of around 45-50 euros.

It is important to note that the final auction price will depend on several factors, such as the demand at that specific moment, the competition from other bidders, and the willingness of buyers to pay for this particular coin. Therefore, it is advisable to stay alert during the auction and adjust the bid accordingly.