well.......
I'd expect the entire Pacific coast was fortified or had armed naval vessels offshore at many or most points during WWII, so a 20mm rd in the vicinity could be easily explained. I was on a hurricane cleanup for Ivan a few years back and a member of my team turned up a 40mm Bofors round in coastal Gulf Shores AL . The Hazmat officer pitched a holy fit.
Not an expert, but that projectile looks odd..........I dunno. I have a 20mm Ork. round that was used as a paper weight, engraved with dates from a mfg plant I suspect, that looks nothing like what you have.
The effects of corrosion may have "pruned" your projectile somehow.
Almost looks like a cannister round don't it?
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