Based on the data provided, we can observe that the coin in question has had an average auction closing price of 179.11 euros in previous auctions. Additionally, the condition of this coin has been described as '70 (MBC-)'.

Considering that the condition of the coin is relatively good and the average closing price has been 179.11 euros, we could estimate a maximum purchase price around that value or slightly higher, taking into account that the coin has been sold in the past for prices ranging between 40 and 350 euros.

Therefore, an estimated maximum purchase price for this coin in the next auction could be around 180-200 euros, considering the condition and previous closing prices.