Based on the data provided, we can observe that the coin in question has had an average auction closing price of 58.89 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 average closing price has been 58.89 euros and the coin's condition is 70 (VF+), we could estimate a maximum purchase price around 60-65 euros. Given that the starting price in this auction is 30 euros, it is likely that competition from other bidders will drive the final price above this value.

Therefore, an estimated maximum purchase price for this coin in the next auction could be around 60-65 euros, taking into account its previous auction history and condition.