Based on the data provided, we can observe that the coin in question has had an average auction price of 1013 euros in previous auctions. Additionally, its current condition is 80 (MBC+).

Considering that the coin will be auctioned in the coming days with a starting price of 1400 euros and taking into account its previous price history, where the estimated price has ranged between 800 and 1200 euros, we could estimate a maximum purchase price around 1300-1400 euros.

Given that the starting price this time is 1400 euros and considering that in previous auctions it has reached closing prices close to 1200 euros, an estimated maximum purchase price could be around 1300-1400 euros, considering the condition and demand for the coin in question.