Real story on 69 Camaro caliper date codes

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Is there any definitive GM document that refers to date codes on 5463633 69 Camaro calipers. I’ve read a numbers of the threads on line and the majority believe the three digit number on the caliper is a Julian date code. But talking to others including Lone Star Caliper they say that the three digit number is not a date code, more likly a batch number. What’s the real story. Do judges consider that a date code. Just curious.