For any readers here who don't already know it, here's a relic time-dating tip. If the object is American-made and has a marking saying "Pat" or "Patent(ed)" followed by a number rather than a date, it is no older than the early-1900s. For US-patented objects, the change from using a date to a Patent number happened sometime in the 1920s, if I recall correctly. Somebody here might know the exact year, but my now very elderly brain has forgotten it.