Does anyone know how many 2 1/2 inch 19-2s were made in 1966 before the 19-3 came out in 1967? Or maybe the first serial number for a 2 1/2 inch 19-2?

Thanks

Although the -3 change was announced in 1967, -3 marked frames didn't really start showing up until later in 1968 with an overlap of -2 marked frames (but with the -3 rear rear sight leaf screw) shipping into 1969.

Here's my -2 (K7943xx) that shipped in Mar, 1969