Based on the data provided, we can observe that the coin in question has had an average auction price of 131.74 euros in previous auctions. Additionally, the condition of the coin on this occasion is estimated to be 70 (VF+).

Considering that the starting price in this auction is 100 euros and the condition is 70, we can estimate a maximum purchase price based on the average auction price and the current condition. Given that the condition is relatively good but not excellent, we could consider a maximum purchase price around 140-150 euros.

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.