Original pre-war and very rare chain type bike lock. Marked Made in Germany with a wing and wheel motif it still has its key. It is in good condition, currently coated lightly with oil. It works well. These are very hard to find, as it was not a common style of lock. Its style and construction indicate it is likely pre-1920's. The advertisement is from the 1931 Stukenbrok Hauptkatalog. It is a total of about 14 1/8" long.