The artist with the same signature and the manner of writing in a network is found. But no evidence it does not, moreover, that he worked in the XX century. Not even clear, a German, he or American. In general, artists with the surname Schmidt lot, there are the names that start with "K", and among them are famous, but they have all the signatures are different. See
http://www.liveauctioneers.com/item/7534150, there and assess the work of the artist in the 200 - $ 300.