Based on the data provided, we can observe that the coin has had an average auction closing price of 74.82 euros in previous auctions. 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 closing price has been 74.82 euros, we could estimate a maximum purchase price around that value or slightly higher, taking into account that the coin has been sold in the past for higher prices.

Therefore, an estimated maximum purchase price for this coin in the upcoming auction could be around 75-80 euros. It is important to note that the final price will depend on the demand at the auction and other factors that may influence the bidding of interested buyers.