Based on the data provided, we can observe that the coin in question has had an average auction closing price of 37.33 euros in previous auctions. Additionally, its current condition is 85 (ebc-).

Considering that the starting price for the next auction is 18 euros and the average closing price has been 37.33 euros in the past, we can estimate a maximum purchase price around 40-45 euros, taking into account the coin's condition and price history.

It is important to note that the final auction price may vary depending on factors such as demand at that specific time, competition from other bidders, and interest in the coin in question.