1969 Z/28 rear end date code

[JCHansen1]

Hello,

Help me out with the numbers on a Z28 I'm looking at. No BS or POP. Norwood car. Data tag is a 5A, (first week May). Rear axle stamping is BU0513, (3.73 posi) which would theoretically be a week or more past the body build date. Diff casting date is under layers of crud I did not scrape away, so the whole thing could be a year off, I think BU's first cam in 68. Anyone seen a diff dated a week or so after body build date. It seems plausible to me, but not if its never been seen before. It's not supremely important since I already know the gearbox is not original, but more curiosity than anything. Thanks!

[bcmiller]

Pm me the VIN and axle stamp, then I can check. There are no cars with 05B on the tag.

It's probably the original.

[JCHansen1]

PM sent