Based on the data provided, we can observe that the coin in question has had an average auction closing price of 140.69 euros in previous auctions. Additionally, its condition has been described as '70 (MBC-)', indicating that it is in an acceptable but not excellent condition.

Considering that the average auction closing price has been 140.69 euros and the coin's condition is 70 (MBC-), we could estimate a maximum purchase price around 150-160 euros. Given that the coin has been auctioned 19 times in the past and has had a good level of sales, this price range could be a reasonable estimate for a potential purchase in a future auction.