The number is probably 11223. That's just the build sequence number. These numbers started each model year at 1001 for the first unit built, so yours was the 10223rd AGCA unit built (at Flint). That prefix was also used for the 3600 series.


Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"