These cards were produced by Treff in Zürich. The maker's name is on the Deuce of Shields and on the Deuce of Bells.
This is a pack with the single-faced Swiss pattern with Swiss suit-signs. The cards look pretty old, but actually they were most probably produced between 1940 and 1960. A special characteristic are the Banner cards instead of the Tens; this has a long tradition in Swiss- and German-suited packs.