Based on the data provided, we can observe that the coin in question has had an average auction closing price of 72.89 euros in previous auctions. Additionally, its current condition is 30 (BC+).

Considering that the average auction closing price has been 72.89 euros and that the current condition is relatively good (30), we could estimate a maximum purchase price around 80-85 euros. However, keep in mind that this is just an estimate and the final price may vary depending on the demand at the auction and other factors.