I’ve been subbed to hickock45 for years and saw his original video on this gun. The one he said he sold to John. I picked up my 19-3 with 4-inch barrel used in 1984. I won’t ever sell this one. You should be able to make out the S.C.S.O. below the cylinder. The S.C. could be dozens of places but I’m pretty sure the S.O. stands for Sheriff’s Office.
My other half has a 19-4 with 6-inch barrel. Softer shooting.