Based on the data provided, we can observe that the coin in question has had a starting price in previous auctions ranging from 12 to 70 euros, with final prices ranging from 16 to 75 euros. The coin's condition has been maintained at a level of 80 (VF+).

Considering that the average final price has been 35.13 euros and the coin's condition is at a level of 80 (VF+), we can estimate a maximum purchase price for this coin in the upcoming auction. Given that the starting price is 25 euros and the average final price has been 35.13 euros, we could consider an estimated maximum purchase price around 40-45 euros, taking into account the condition and previous final prices.

It is important to note that the final auction price may vary depending on factors such as demand at that specific moment, competition from other bidders, and the particular interest that this coin may generate in the auction in question.