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Morrow Hub Serial Numbers

A letter and single digit number are the year and date.
The letter is the year starting in 1931.
The number is the month.

(example: "E11" is November 1935)

A = 1931
B = 1932
C = 1933
D = 1934
E = 1935
F = 1936
G = 1937
H = 1938
I = 1939
J = 1940
K = 1941
L = 1942
M = 1943
N = 1944
O = 1945
P = 1946
Q = 1947
R = 1948
S = 1949
T= 1950