Based on the data provided, we can observe that the coin has had an average auction price of 105.85 euros in the past. Additionally, the condition of the coin in this auction is 85 (VF+/EF-).

Considering that the average auction price has been 105.85 euros and that the condition of the coin is quite good (85), we could estimate a maximum purchase price around 110-120 euros. Given that the coin has been auctioned 69 times in the past and has performed well in terms of auction price, a maximum purchase price of around 110-120 euros could be reasonable.

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