Based on the data provided, we can observe that the coin in question has had an average auction price of 85.32 euros in previous auctions. Additionally, its condition has been described as '70 (MBC-)'.

Considering that the condition of the coin is good but not excellent, and that the average auction price has been 85.32 euros, we could estimate a maximum purchase price around 90-95 euros. This is because the coin has performed well in previous auctions and its condition is acceptable.

It is important to note that the final auction price may vary depending on factors such as demand at that specific time, the number of interested parties in the coin, and other elements that may influence the final bid.