Based on the data provided, we can observe that the coin in question has had an average auction price of 1238.13 euros in previous auctions. Additionally, its current condition is estimated at 80 (VF+).

Considering that the starting price for the next auction is 1400 euros and that the coin has performed well in previous auctions, we could estimate a maximum purchase price slightly higher than the historical average auction price. Given that the current condition is good but not excellent, we could consider a maximum estimated purchase price around 1300-1350 euros.

It is important to note that the final auction price may vary depending on factors such as demand at that specific time, competition from other bidders, and the perceived value of the coin at that occasion.