The trike itself shown in the catalog is actually minimate stuff (even shows a clinton engine, steel one piece wheels, and steel fender) so its something after allied Leisure/Regis taking back control of Michrina ent. (its also not in the any LI catalogs or mag adds up to 1971). the decaling for serial number is also post 70 from what I have seen and typically found on the later-mid 1970s stuff that shows up where the bikes start to show up pieced together oddly if they are still one piece frames.
the specs list a 512 model 197cc 5hp, and those weren't available until Oct 1971 and extremely rare to find a pre 1972 dated HS50 (5hp 197cc) on ANYTHING. The multi piece frames (on the minibikes) that used plastic/unbreakable fenders, band brakes, etc.. were a mid 1970's-up deal, the basis of all that came from Regis's Minimate lineup that was created by him at allied leisure when he spilt and again all the types of parts starting to show up post 1972 on the LI line of bikes.
While I highly doubt that the bike actually came with the Rupp wheels, It is noted that Regis was buying up parts at auctions when company's were liquidating and going out of business during the 1970/80's. If the wheels truly were factory installed, that would put it post 1975 as they did "name drop" Rupp in their history and buying out truckloads of parts from them in '75.
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