Based on the data provided, we can observe that the coin in question has had an average auction price of 120.23 euros in previous auctions. Additionally, the current condition of the coin is 70 (VF+), indicating that it is not in the best condition.

Considering that the average auction price has been 120.23 euros and the current condition is 70, we can adjust the estimated maximum purchase price downwards. Since the coin will be auctioned in the coming days with a starting price of 70 euros, we could consider an estimated maximum purchase price around 110-120 euros, taking into account the condition and previous prices.

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 to adjust the offer accordingly.