Based on the data provided, we can observe that the coin in question has had an average auction price of 106.71 euros in the past. Additionally, its current condition is 70 (VF-).

Considering that the coin will be auctioned in the upcoming days with a starting price of 25 euros, we can estimate a maximum purchase price based on the historical average auction price and the current condition. Given that the condition is good but not excellent, and the average auction price has been 106.71 euros, we could consider a maximum purchase price around 120-130 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 pay attention to the auction to adjust the offer accordingly.