Based on the data provided, we can observe that the coin in question has had an average auction closing price of 609.93 euros in previous auctions. Additionally, it has been auctioned a total of 80 times in the past, with an average starting price of 488.68 euros.

Considering that the current condition of the coin is 80 (VF+), and taking into account the previous prices of similar auctions, as well as the gradual increase in closing prices over time, we could estimate a maximum purchase price around 900-1000 euros.

It is important to note that the final auction price will depend on several factors, such as demand at the time of the auction, competition from other bidders, and interest in the particular coin. Therefore, it is advisable to pay attention to the auction and adjust the offer accordingly.