Based on the data provided, we can observe that the coin in question has had an average auction closing price of 60.82 euros in previous auctions. Additionally, the condition of this coin has been described as '30 (BC+)'.

Considering that the condition of the coin is relatively good (BC+), and taking into account the historical auction closing prices, as well as the average closing price, we could estimate a maximum purchase price of around 70-80 euros for this coin in the upcoming auction. It is important to note that the final price may vary depending on factors such as demand at the auction and competition from other bidders.