Based on the data provided, we can observe that the coin in question has had an average auction price of 152.79 euros in previous auctions. Additionally, its condition has been described as '70 (MBC-)'.

Considering that the coin's condition is good but not excellent, and that the average auction price has been 152.79 euros, we could estimate a maximum purchase price around 170-180 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 will depend on factors such as demand at the time of the auction, competition from other bidders, and buyers' willingness to pay a higher price for this particular coin.