So many variables make it a bit confusing especially when the SCSW says the N and K magnums go from P&R to non P&R in a new revision change,
Problem is the old Rule No#1 "There are No Rules with S&W" and S&W didnt waste good parts so we see N and K Magnums with recessed cylinders and non pinned barrels , those would still have the old revision number as the new cylinder had not come into use yet .
On a side note the L frame .357's were introduced Non P&R.
The K-38, K-32, J-38 and J-32 are a different story as they never had recessed cylinders so when S&W stopped pinning the barrels no revision change was necessary until the new yoke retention system was introduced around 1988.
The K-22 and J-22's are similar but in the opposite way because they never stopped getting recessed cylinders (even up to current production) likewise the barrel pin deletion also did not warrant a new revision since no parts changed until the new yoke retention system in 1988 .
Here are a few of what your looking for:
First is this 19-4 snub that was overstamped as a 19-5 with a 250K serial prefix (1983-85?) No barrel set pin and non recessed cylinder ,
my guess is the frames were made up first and stamped as 19-4's but when this one reached the cylinder fitting point the supply of recessed cylinders was depleted so it was overstamped as a 19-5 and fit with the new non recessed cylinder (BTW this gun had a groove cut in its barrel for a barrel set pin when disassembled ).
19-5 (L) with 19-7 K Comp.
Next is this non pinned Model 67-1 (L) Serial AHY 62xx shipped in 1985 with new alpha serial prefix and new L side TM (67-3 at right) :
Nickel 27-2 (Right) serial N941xxx shipped in Feb 1984 with a recessed cylinder and non pinned barrel,
Blue 27-2 serial N762xxx (Left)shipped June 1982 and is P&R :
Model 18-4 (Lower Left)Serial 270K8xx Shipped May 1985 with non pinned barrel and new L side TM
(17-5 above right):