Based on the provided data, we can observe that the coin in question has had an average starting price in previous auctions of 74.58 euros, with an average closing price of 223.6 euros. Additionally, it has been auctioned a total of 12 times in the past, sold in 10 instances and not sold in 2 instances.

The current condition of the coin is 75 (F-VF), indicating it is in a medium to low condition. However, in previous auctions, significantly higher closing prices have been achieved, such as 950 euros in a 2018 auction.

Considering these data points, as well as the upcoming auction of the coin in the next few days, and taking into account the current condition of 75 (F-VF), we could estimate a maximum purchase price around 250-300 euros. This estimation is based on the fact that higher closing prices have been achieved in previous auctions, exceeding 200 euros, and that the coin is in a medium to low condition on this occasion.