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A few threads on the subject here. Doing an internet search tells us a lot!
https://en.wikipedia.org/wiki/Swastika

They came from Supplee Hardware.

Quote from Manah; "Supplee Hardware Co. was in business 1905-1920's. This hardware was at 503 Market Street, Philadelphia, Pennsylvania. They were the outgrowth...

Yeah. they move too fast, flip by accident. No under 5/8 for me, for the most part.
They can be 'face eaters' as well!

I have recently acquired a Worcester. Darn good shaver, typical hard...