All the guys who are at Tulsa can tell you a lot more. I think Evaluators was a jobber, but may be wrong about that - maybe just a dealer. Given the flavor of the "local clientele," I suppose they had a staff gunsmith who checked out the product just to be sure they were all in good shape before turning them over to the various customer LE-types, thus the "Ready for Service - Evaluated." The company name frequently turns up in S&W stories from the 60s and 70s.

That is certainly a nice looking specimen you have there. You didn't mention it but I assume the holster came with the gun... ?