Based on the provided data, we can observe that the coin in question has had an average auction closing price of 100.24 euros in previous auctions. Additionally, its current condition is 85 (ebc-).

Considering that the starting price for the upcoming auction is 40 euros and that the coin has performed well in previous auctions, we could estimate a maximum purchase price around 120-130 euros. This is because the average closing price has consistently been higher than the starting price, and the coin's condition is quite good.

It is important to note that the final auction price may vary depending on the demand at that specific moment, but based on historical data, an estimated maximum purchase price of around 120-130 euros seems reasonable.