Based on the data provided, we can observe that the coin in question has had an average auction closing price of 99.29 euros in previous auctions. Additionally, the condition of this coin has been described as '70 (MBC-)'.

Considering that the condition of the coin is good but not excellent, and that the average closing price has been 99.29 euros, we could estimate a maximum purchase price around 110-120 euros. It is important to note that this is just an estimate and the final price may vary depending on factors such as demand at the auction and competition from other bidders.