Model number. * KING INDUSTRY — Factory name or brand. * A clear crown logo in the upper right, which appears to be a trademark. * TRADE MARK — means the logo is registered/used as a trademark. * THE BEST QUALITY — a marketing phrase. * And on the brass plate, I can read almost clearly: NEW KASHMIR LOCK BELIVERS R Here I am more conservative than my previous estimate. From the way the body is manufactured, the rivets, the shackle, the hand-engraved/etched patterns, and the brass plate, I see it as an old piece and not a modern lock. My current estimate: Around 1940–1970 AD And I give a good probability that it is from the mid-20th century.