It's not that rare but rather uncommon. 5278 were manuf. 278 were no dash and 5000 in dash 0, 1 and transitionnal 2.
They were introduced in November 1989 and production ended in 1993
627 1989 Stainless steel introduction
627-0 1989 – 1993 Longer stop notches
627-1 1993 Drilled and tapped top strap
627-PC 1997 – 1998 Performance Center (PC) old frame, 8-shot
627-2 1998 – 2002 Not PC, new CNC Frame, 6-shot
627-3 1999 – 2002 PC, new frame, 8-shot
627-4 2002 PC, internal lock, .38 Super, 8-shot
627-5 2003 – Current 8+ PC, internal local, .357 Magnum, 8-shot, available in several configurations.
