Jim, I could be wrong here (and if I am anyone that knows better feel free to correct me) but I am showing Safari Arms as being their own manufacture and not simply an importer of Norinco firearms.
In 1978 Safari began manufacture in Olympia, WA. and was bought out by Olympic Arms in 1987, which may explain the changes in the markings.
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Gunslinger
TFL Imperial Potentate
TFL End of Summer Meet, August 12th & 13th, 2000