Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 600 euros and is in a conservation grade of 80 (MBC+). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 410 and 1200 euros.

The average closing price of this coin in previous auctions has been 580.78 euros, while the average starting price has been 488.64 euros. Considering the good conservation grade of the coin (80), and taking into account the previous closing prices as well as the current starting price, we could estimate a maximum purchase price around 700-750 euros.

It is important to note that the final auction price may vary depending on factors such as demand at the time of the auction, competition from other bidders, and specific interest in this particular coin.