Antique Wooden Accordion

Antique Wooden Accordion I believe this to be an old Germany Accordion.  This accordion has blue checked bellows that are in good condition.  The clasp on both sides does work.  The leather covered strap has deteriorated and is only attached on one end on one side. The other side with a strap is in much better condition.  Please see photos.  The plugs and buttons I will call them have deteriorated but do still move. There are two metal labels with text. One reads: unzerreissbarer extrabalgen. While the other reads: United States Patent No. 318242. This patent was established in 1931. Approximately 6 1/4″ x 10″ including the grips/handles x 12 7/8″ not including buttons