To the original poster, I am interested in K22 from 1947 thru the mid 60's. I generalize by using round numbers like:

numbering started in 1947 K101 (ok a handful shipped in 1946, but I will never see them)

by 1950 they had hit 100k
1955 250k
1960 400k

I did say in general and the rounding thing. But it is a handy guide

Charlie