Based on the data provided, we can observe that the coin in question has had an average starting price of 24.64 euros in previous auctions. The average closing price has been 20.13 euros. Additionally, the current condition of the coin is 85 (ebc-).

Taking into account the coin's previous auction prices and its current condition, we can estimate a maximum purchase price. Since the current starting price is 25 euros and the condition is quite good (85), we could consider an estimated maximum purchase price around 40-50 euros.

It is important to note that the final auction price may vary depending on the demand at that specific moment, so it is advisable to monitor the auction's progress to adjust the offer accordingly.