Wasn't that style also used for the '70 model year, which would put the date stamp within regular production?
Reference source is https://www.sites.google.com/site/id...e/clocks-1960s which has a lot of great info to ID clocks, gauges and radios.
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Tim in NSW, Australia
1969 Van Nuys 04A Z/28 from Clippinger Chevrolet.
Cortez Silver with dark blue interior.
Ran at Lions Dragstrip and Pomona Raceway, with paint by Bob Kovacs of Fresno.
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