Based on the provided data, we can observe that the coin in question has had an average auction closing price of 127 euros in previous auctions. Additionally, its current condition is 70 (MBC-).

Considering that the coin's condition is relatively good and the average auction closing price has been 127 euros, we could estimate a maximum purchase price around that value or slightly higher, taking into account that the starting price this time is 40 euros.

Therefore, an estimated maximum purchase price for this coin in the upcoming auction could be around 130-140 euros, considering its auction history and current condition.