Based on the data provided, we can observe that the coin in question has had an average auction price of 5315.5 euros in the past. Additionally, its current condition is estimated at 30 (BC+).
Considering that the starting price at the next auction is 800 euros and that the coin has had an average auction price of 5315.5 euros in the past, we could estimate a maximum purchase price around 5000 euros, taking into account the current condition of the coin.
It is important to note that this is just an estimate and the final auction price may vary depending on various factors such as demand at that specific time, competition from other bidders, and interest in the coin in question.