Based on the data provided, we can observe that the coin in question has had an average auction closing price of 80.95 euros in previous auctions. Additionally, its condition has been described as 70 (VF+), indicating that it is in an acceptable but not excellent condition.

Considering that the starting price for the next auction is 20 euros and the historical average starting price is 47 euros, we can estimate that the closing price could be in a similar range to the previous average closing price, around 80-85 euros.

Given that the coin's condition is 70 (VF+), which is acceptable but not excellent, and the historical average closing price has been 80.95 euros, we could estimate a maximum purchase price of around 85 euros for this coin in the next auction.