Based on the data provided, we can observe that the coin has had an average auction price of 107.13 euros in the past. Additionally, the condition of this coin has been described as '75 (VF).'

Considering that the condition of the coin is 75 (VF) and the average auction price has been 107.13 euros, we can estimate a maximum purchase price for this coin in the upcoming auction. Given that the condition is not the highest, but also not the lowest, and taking into account previous price history, we could consider an estimated maximum purchase price around 120-130 euros.

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