Based on the provided data, we can observe that the coin in question has had an average auction closing price of 85.86 euros in previous auctions. Additionally, its current condition is estimated at 75 (VF).

Considering that the starting price for the upcoming auction is 25 euros and the historical average starting price is 54.5 euros, we can infer that the coin tends to achieve higher prices in auctions.

Given the current condition of 75 (VF) and considering the previous auction closing prices, as well as the fact that the coin has sold in most previous auctions, 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 factors such as demand at that specific time, the presence of other interested collectors, among others.