Original German Buchstabenschloss or letter combination lock. New old stock from the original box! Very interesting 1930's lock frequently advertised in period catalogs and magazines; the photo is from the 1931 Stukenbrok Hauptkatalog.
Each lock has its own word. Some may have very light rust, but all are new old stock. They are still on their original cardboard backing card. Simply enter the word between the two marks on the bottom of the lock and pull the lock apart to open.
Measures approx. 1 3/8" tall. Opening is approx. 1" wide x 1/2" tall and the diameter of the bar is roughly 1/4".