What time frame where the 19-2s made....................................M*
with the 2.5" version being introduced in August, 1966....the 19-2s probably started shipping in 1963 or late 1962.
If the reason you want a -2 is for pinned and recessed, then I wouldn't sleep on the -3s. I recently got a nice 2.5" 19-3 that has pinned barrel and recessed cylinder chambers. Got it earlier this year at a LGS.
The same can be said for 19-4s. Picked up this minty 1978 nickel P&R -4 at my lgs a few years ago for $550. Great shooter!