I cannot tell you anything about your rifle, but can tell you that "Hawthorne" was a trade name used by Montgomery Ward & Co. in the 1960s for their guns and probably other outdoor items. (I still have a Hawthorne shotgun from that period.) Mossberg may well be the manufacturer of the rifle in question, I know the company produced guns for other retailers.
FWIW you might consider posting this in the "Firearms Research" forum - the guys there seem to be pretty sharp on identifying "whatsits?"
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