This 4006CHP model lettered as being sent to the CA Department of Parks and Recreation, Parks Services Division in Sacramento, CA.
According to the letter, it was the only one in its VZE serial number range, so it was not part of a larger contract order batch.
It could very well have been the contract sample sent to Sacramento for approval. In the 3rd Edition of the Standard Catalog of S&W, this particular pistol (VZE2492) was listed under "variations" as the known example of a CA State Park 4006.
Fresno Co. Sheriff 4506-1, these came on the secondary market after they transitioned to 4566's. I obtained mine from a local PD officer/armorer, who got it unused from the Fresno SO armorer.