Since the article was based on the numbers Hagerty sees, maybe some esoteric or low production models missed the cut because there are just not enough out there. Some might be parked in the family room and not ridden, and owners think they don't need insurance.
The John Player Norton Commando is quite interesting but I don't know the market. Only 200 built in 1974 and I read where only about 120 might be in the U.S. It was a European spec 850 with shifting on on the proper, traditional side - the right. This was kind of a replica racer. It could be ordered with the 750cc short stroke engine that was in the bikes homoligated for AMA racing in the U.S. That would be a rare bird. I don't know if I can post pictures but here goes....
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http://www.surfacezero.com/g503/data/500/John_Player_Norton.jpg[/img]
The Norton Commando Production Racer is a rare one. This was more tweaked for performance than the JPN. I like it because it shows the engine. This is a 1971:
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http://www.surfacezero.com/g503/data/500/Norton_Production_Racer_1971.jpg[/img]
Above pictures from ClassicMotorcycles.com.
As for Indians, a more collectible model than the Chiefs are the Sport Scouts. Smaller 45 cubic inch engine. Lighter bike. I think the best looking is the 1940 which was the one year it got the Chief full skirted fenders but on it's 1939 rigid frame. In 41 the Sport Scout got the heavier Chief rear suspension frame and that made it look kinda clunky back there. This is what I mean, from a Mekum auction:
[img]
http://www.surfacezero.com/g503/data/500/medium/Indian_Sport_Scout_1940_Mekum_Auctiion.jpg[/img][/ur...]