Based on the data provided, we can observe that the coin in question has had an average auction closing price of 104.02 euros in previous auctions. Additionally, the condition of this coin has been described as '70 (VF-).'

Considering that the condition of the coin is relatively good and the average closing price has been 104.02 euros, we could estimate a maximum purchase price around 110-120 euros. Given that the starting price in this auction is 25 euros, it is likely that the final closing price will be higher, but it is important to consider that the final price will depend on the demand in the auction and the competition from other potential buyers.

In summary, an estimated maximum purchase price for this coin at auction could be around 110-120 euros.