The two step lugs are unusual. As Fred says, the case shape is common to the 40s & 50s.
As a guess, I'd say maybe these are early 40s as they are more rounded and deco style - JLC lugs tended to become straighter and more "modernist" towards the early 50s. But JLC had a lot of funky lugs in the 50s too, so you never know.
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