But the AVL engine wasn't really the same engine, was it?
No, the AVL was a sort of interim design between the more-or-less "original" 1954 pre-unit (separate gear box and primary drive) Iron Cylinder Engine and the subsequent Unit Construction Engine (UCE) with the integrated gear box, etc.
"AVL" stands for "Anstalt für Verbrennungskraftmaschinen List" (German for "List Institute for Combustion Engines", "List" being the family name of its founder), the Graz-headquartered Austrian company which developed the engine for Enfield (India). For more details on the company, see:
https://en.m.wikipedia.org/wiki/AVL_(engineering_company). They were exported to the States roughly 2008 to 2010. Personally, I think the engine's one of the prettiest Enfield ever produced, but they're not without their peculiar issues, though these can be largely remedied.
As for that Bullet in Chico, it ain't an AVL, but isn't that the same one that keeps popping up there in that town like a bad penny? My hunch is it may be an illegal "grey import", namely an Indian home market model somehow shipped here lacking US DoT certification. Hence, it may be extremely difficult to legally register here in the Land of the Plastic Spork...certainly in Kalifornia. You never see a license plate in its ads, do you? And where's the title status info craigslist prompts a seller to provide by default?
My "spidey sense" just pegs the meter hard with this one...