WHAT DOES DAN WESSON SPECIALIST MEAN?

I've witnessed a couple of posts in this article about doable dates of 1978 for serial quantities starting off in 16**** but I just lately picked up a an outdated Pistol pack in the initial brown Dan Wesson case With all the factory unattractive yellow covering over the foam. Mine is the full lug model 357 and my serial amount starts off off with 1