Serial numbers are on a plate on the right front door hinge pillar.
6 cylinder on crankcase to rear of distributor. Engine numbers were HA-1001 to HA-1320152
The first numbers in the serial number designate the assembly plants as follows:
Tarrytown, New York
St. Louis, Missouri
Kansas City, Missouri
Los Angeles, California
The second symbol indicates model year: H=1950.
The third symbol indicates model and series:
J=Special 1500 series, K=Deluxe 2100 series.
The last four symbols are the production sequence by assembly factory:
Production sequence numbers for 1950 Specials built in Michigan: HJ-1001 to HJ-49801.
Production sequence number for 1950 Deluxes built in Michigan were HK-1001 to HK-187118.