Based on the data provided, we can observe that the coin has had an average auction price of 311.91 euros in the past. Additionally, the condition of the coin in this auction is 70 (MBC-).

Taking into account the previous prices of the coin and its condition, as well as the fact that it will be auctioned in the coming days, we can estimate a maximum purchase price of around 350 euros. It is important to note that this is just an estimate and the final price may vary depending on the demand at the auction and other external factors.