Based on the data provided, we can observe that the coin has had an average auction closing price of 78.96 euros in previous auctions. Additionally, the condition of the coin on this occasion is described as 70 (VF+), indicating a fairly acceptable condition.

Considering that the starting price in this auction is 40 euros and the historical average closing price is 78.96 euros, we could estimate a maximum purchase price around 80-85 euros, taking into account the condition of the coin and the previous price history.

It is important to note that the final auction price may vary depending on the demand at that specific moment, so it is advisable to monitor the auction's progress to adjust the offer accordingly.