Punch-Lok Clamp Master

  Here's a little pressed steel ratchet wrench, fortunately with the patent number  (2507455) stamped in so I discovered that it dates to 1950. I was sure I'd found something rare as it doesn't appear at DATAMP! 

 Turns out it's a specialized tool- part of a kit for applying pre-formed hose clamps and it's still available 75 years later at Nathankimmel.