Chevrolet dealer parts department clock

[Ls6 Ragtop]

Picked this clock up a while ago and just getting around to checking it out to see what works and what doesn't. Usually there is some kind of manufacturers markings or date code on these but this one doesn't appear to have any.
Was curious if anyone here has ever seen another like it to help identify it.
It is pretty big at around 5 feet wide and has real wood cabinetry not cheap plastic so it was meant to be around for a while. With the graphics and changeable advertising panel on one side I'm assuming it was for a parts department.
Chris