[William]

There is another aspect to this no one has considered.

I have been to hundreds of cars shows over the 33 years I have messed with these things, usually with a notebook in hand recording data off '69s. At SC-Indy years ago I acquired data from a "restored" '69 Z/28. The car has a repro tag and a non-OE DZ motor; date way off. However the body number on the repro tag is in sequence with two other known Glockner Chev COPOs. It is possible this car [and others...] was purchased as a rolling shell with no engine/trans in the early '80s before much was known about COPOs. Since it had discs and a 12 bolt it was done up as a Z/28; the X11 or X44 tag went away. Other COPOs may have been restored as 396 Super Sports.

I will not reveal the VIN of the car in question. Hope the OE tag was retained.