THANKS Fessor for the confirmation. Just in case anyone here is interested enough to delve into it, I'm including the Link to my initial Forum Post, & subsequent Thread relating to my 4" DSS example.

RE: S&W Model 19(-5) 4" ROUND BUTT - U.S. GOVT. CONTRACT

Hopefully, by re-initiating this particular Thread, perhaps we'll be able to learn additional facts concerning this interesting run of U.S. Federal L.E. issue Revolvers ? Just for the record regarding this Contract, it was produced at the very end of the Revolver's rule as the weapon of choice for U.S. Law Enforcement Officers. At the exact same time as these were being issued to our Federal Agents, Law Enforcement was rapidly transitioning to the 9mm Semi-Automatic Pistol for overall issue as a Duty Weapon. That in fact is what led to many of the brand new, unissued & boxed examples becoming available to us for civilian purchase. IIRC, Lew Horton may have had a hand in the distribution of these now 'surplus' Revolvers.

Best, dpast32