WHAT DOES DAN WESSON SPECIALIST MEAN?

I have found a number of posts in this article about achievable dates of 1978 for serial quantities beginning in sixteen**** but I recently picked up a an aged Pistol pack in the original brown Dan Wesson case Along with the factory unappealing yellow masking over the foam. Mine is the full lug model 357 and my serial range starts off with 136*** a