Based on the data provided, we can observe that the coin has had an average auction closing price of 65.39 euros in previous auctions. Additionally, it has been auctioned 20 times in the past, of which it has been sold 18 times.

The current condition of the coin is 75 (VF), indicating that it is in an acceptable but not excellent condition.

Considering the previous auction prices of the coin, as well as the average closing price, and taking into account that the coin will be auctioned in the upcoming days, we could estimate a maximum purchase price around 90-100 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 pay attention to the auction to adjust the offer accordingly.