Hi Chuck, I picked up a Model 15-3 4" today. SN# 6K848XX.
I also have the backwards 3 as the & in Smith & Wesson.
The seller says it is former LE service piece but doesn't know the dates.
Freedom has a taste to those who fight and almost die, that the protected will never know.
"Comment is free, but facts are sacred." C.P. Scott, 1921