Based on the provided data, we can observe that the coin in question has a conservation grade of 80 (MBC+), indicating that it is in fairly good condition. Additionally, it has been auctioned seven times in the past, being sold in five of them.

The starting price for the upcoming auction is 450 euros, while the average starting price in previous auctions has been 663.24 euros and the average closing price has been 858.72 euros.

When analyzing the previous prices of this coin, we can see that it has experienced fluctuations in its value, with starting prices ranging from 55.87 euros to 2815.01 euros. The estimated price has also varied, with values ranging from 58.72 euros to 3518.76 euros.

Considering the good conservation of the coin and taking into account the previous prices as well as the current starting price, we could estimate a maximum purchase price of around 900 euros. It is important to note that the final price at auction may depend on demand and other market factors at that time.