Based on the data provided, we can observe that the coin has had an average auction closing price of 31.38 euros in previous auctions. Additionally, the condition of the coin on this occasion is 70 (MBC-).

Considering that the average auction closing price has been 31.38 euros and that the condition of the coin is 70 (MBC-), we can estimate a maximum purchase price around that value. Since the condition is not the highest (FDC), it is likely that the price will be below the historical average auction closing price.

Therefore, an estimated maximum purchase price for this coin in the next auction could be around 30 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.