Based on the data provided, we can observe that the coin in question has had an average auction closing price of 317.04 euros in previous auctions. Additionally, its condition has been maintained at an average of 85 (ebc-).

Considering that the starting price in the upcoming auction is 325 euros and the estimated average closing price has been 317.04 euros, we could estimate a maximum purchase price around 330-340 euros, taking into account the trend of previous prices and the condition of the coin.

It is important to remember that the final auction price may vary depending on the demand at that specific moment, so it is advisable to pay attention to the auction to adjust the offer accordingly.