Antique ANDs KOCH Trompeter Harmoniker

Description

This is a antique Koch's Harmonica.(The name Otto Ruckgaber is written on the back) I am not sure of its date, but it appears to be from early 1900's based on other Koch harmonica listings. I am not an expert antique collector, so please ask any questions if you have any. As you can see it is suitably worn for an item as old as it is. As well, as you can see from the pictures that one of the ends of the top cover is missing.