From The Standard Catalog of S&W.
The 10-9 (1988) introduced a "new yoke retention system/radius stud package - standard barrel".
The 10-10 introduced a "new yoke retention system/radius stud - heavy bbl." (1988), "blue finish only" (1992), "synthetic grips/change extractor system" 1993-94), "delete square-butt configuration and tapered barrel" (1995-96), "shipments in plastic case...serrated backstrap and forestrap on RB x 18mos. then DC" (1996), "4" heavy bbl. only/MIM thumbpiece/Master triggerlock/MIM trigger" (1997).
The 10-11 (1998).
