Hi
I am no expert , but double checking , I would believe first on is a blatant fake , second is issued post 1950s has stitching throughout centre of blade , early ones have single notch, third I believe is early 80s private purchase , due to backing.
Dating these is a minefield....put some of my own here and got zero response.
Hopefully others will put their more knowledgeable expertease in .
Cheers
Steve
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