1949 is the lowest production year with @6000 produced. Serials run from 91L0000 through @91L6000.
1941 was @ 17,000 receivers. Serial numbers run from 0L1 through @1L6500.
Part of the 1941 "mystique" is because of the way the serial numbers work.
0L1 through 0L9999 then 1L0 for number 10,000.
There were no No4 receivers dated '46, '47 or '48.
The 1954/55/56 dated receivers are leftover 1950 receivers with the last date digit removed from the marking die and handstamped during assembly.
1945 dated 90L snipers and early 1949 dated actions show this same characteristic.