Based on the provided data, we can observe that the coin in question has had a starting price in previous auctions ranging from 8 to 30 euros, with estimated prices ranging from 12 to 30 euros. The final auction price has fluctuated between 8 and 12 euros. The condition of the coin on this occasion is estimated at 80 (VF+).

Given that the coin's condition is quite good (80), and considering the previous auction prices, as well as the starting price and average final auction price, we could estimate a maximum purchase price of around 25-30 euros for this coin in the next auction. It is important to note that the final price may vary depending on the demand at the auction and other factors that may influence the decision of potential buyers.