This little button accordion was made by the company Andreas Koch in Trossingen, Germany in the 1920's. Company would eventually be bought by Hohner.
A beautiful instrument with intricate designs in the presswood case and mother of pearl buttons worn from decades of use. Bellows appears to be fully intact and it makes a bright loud sound when expanded and compressed. Keys are mostly working except for two which are missing their little felt pads as pictured. One leather closing strap is damaged but the other holds the accordion shut and both the hand and thumb strap are strong and flexible.
With a little bit of restoration this accordion can be brought back to playable condition or it would make a unique addition to your collection