Based on the data provided, we can observe that the coin has had an average auction closing price of 98.44 euros in previous auctions. Additionally, the current condition of the coin is 90 (EBC).

Considering that the average auction closing price has been 98.44 euros and that the current condition of the coin is quite good (90 EBC), we could estimate a maximum purchase price around 110-120 euros. Given that the coin will be auctioned in the coming days and has performed well in previous auctions, a maximum purchase price of 120 euros could be reasonable.

It is important to consider that the final auction price will depend on several factors, such as the demand at that specific moment, the competition from other bidders, and the buyer's willingness to pay a higher price for this particular coin.