Based on the provided data, we can observe that the coin has performed well in previous auctions, with final prices exceeding the starting and estimated prices. Additionally, the coin's condition is at an acceptable level (BC+).

Considering the coin's past auction prices, where the final price has been significantly higher than the starting and estimated prices, and taking into account the coin's condition rating of 70 (BC+), we could estimate a maximum purchase price of around 500 euros for this coin in the upcoming auction.

It is important to note that the final auction price may vary depending on factors such as demand at that specific time, the presence of other interested collectors, among others.