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were these actually made/assembled in Australia
Irrelevant to the question of compliance plate. Even foreign-manufactured vehicles were given compliance plates
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did they fit compliance plates in the early 70's
Yes compliance plates started in 1969 ... but i think someone said 1200s didn't get them until 1972? They are safety-related plates, not build date/manufacturers plates. See
AUS Compliance PlateIf your B110 was
Australian-assembled it would have had this manufacturer's plate:
Japan-built 1200s got a manufacturer's plate but it doesn't have a dates. 1200s sold in USA got yet another plate (with actual build month) riveted to the driver's door jamb
Nissan Japan has build-date records of the car number. Given the Car Number, they theoretically could tell you the approximate build date. However they may not offer this as a service (maybe they won't do it) or maybe you communicated with the wrong department. Their historical records/literature department may be more helpful. See
Serial Numbers