I had to go back and look at your pictures twice because Im seeing a correct post war SW "High Speed hammer",
I Agree your gun likely shipped in 1947 and that the wide target trigger doesnt appear until around 1950.
The stocks on your gun are known as diamond "Plain Clothes Magnas" Or PC Magnas by the rounded heel, usually found on later snubs and some 4"ers but definately wrong style and era, correct style for your K22 would be "High Shoulder" Magnas with nickel coated brass medallions used from 1946 to 1950.
An interesting feature on your gun is it was one of the last "One Liners" in reference to the large MADE IN USA as that changed to the 4 line address style shortly after. Your revolver exhibits the first change made in post war K22's because it has a straight ejector rod with knurled end, the earliest post war ones had a barrel style "Large Ejector Rod Knob" or LERK that required the barrel to be cut to clear the rod end, some have been observed with the barrel cut but straight rod and speculation was that they ran out of the barrel end rods before they ran out of the cut barrels.
On a side note I dont think the serial number chart in post #14 is accurate solely because IIRC only a couple snuck out of the factory in 1946 before the holiday shutdown, As evidence I have 3 digit serial number
K 345 , 6" Blue shipped Feb 1947.
Here are a couple of others from my notes:
K22, 6" , Blue, LERK , One liner
Serial K 2684 shipped Aug 1947
OP's serial is here
K22, Blue, One liner, straight rod,
Serial K 18529 Shipped Feb 1948
( same features as OPs gun)