Based on the data provided, we can observe that the coin in question has had an average auction closing price of 121.07 euros in previous auctions. Additionally, the condition of the coin has been described as 70 (VF+), indicating that it is in an acceptable but not excellent condition.

Considering that the average closing price has been 121.07 euros and the condition of the coin is 70 (VF+), we could estimate a maximum purchase price around 130-140 euros. Given that the starting price in this auction is 25 euros, it is likely that the final closing price will be above this value, but it is important to note that the final price will depend on the demand at the auction and other factors that may influence the bidding.

In summary, an estimated maximum purchase price for this coin at the auction could be around 130-140 euros, considering its previous auction history and its condition.