Based on the data provided, we can observe that the coin in question has had an average auction closing price of 43.67 euros in previous auctions. Additionally, its current condition is 85 (ebc-).

When analyzing the previous prices of this coin, we see that it has had an estimated price of up to 66.83 euros in the past. However, the most recent starting price was 40 euros, with an estimated price of 60 euros and a closing price of 50 euros in the last auction.

Taking these data into consideration, as well as the fact that the coin has been auctioned 13 times in the past and sold 6 times, we could estimate a maximum purchase price of around 60 euros, which is the most recent estimated price and close to the historical average closing price.

Therefore, an estimated maximum purchase price for this coin in the next auction could be around 60 euros.