Based on the provided data, we can observe that the coin in question has had an average auction closing price of 152.31 euros in previous auctions. Additionally, the current condition of the coin is 85 (ebc-).

Considering that the average auction closing price has been 152.31 euros and that the current condition of the coin is quite good (85 ebc-), we could estimate a maximum purchase price around 160-170 euros. Since the coin will be auctioned in the coming days, it is possible that the closing price may be slightly higher than this range, but considering the historical information, this would be a prudent estimated price for a potential purchase.