Kiwi,
I think it was the American Importers who wanted the Norton 650cc Export machine, Christened the Manxman!
Excelsior fans wouldn't have been happy with it, really it was a bling, "Califoniased", "Sunny state" Norton Dominator, less like the Isle of Man machines you couldn't imagine, small semi- peanut-ised tank and high bars, they should have called it the "Wildman" !
If they had have brought out a wide-line version "Cafe-Racerised" version, with clip-ons, big alloy tank, rear-sets, half-fairing, low lean lines, contoured seat, & tucked up Sports exhaust & silencer, then the name would have made sense to the British Norton fans, but that's marketing for you. It does look more like what "Johnny" would have ridden if the "Wild Ones" had been re-jigged to the late 50s or early 60s! A proper well thought out, Flat-Tracker/Desert Crosser, would have made more sense to be marketed in the States in the USA that had more sun, than rain!
Probably built trying trying to cash-in on the fringes of the Custom-era, pre-Easy Rider era!
Cheers
John