Thought this might be handy to some of you. If you scroll down on this link there are pdfs of SW catalogs from the 20's - 90's
I highly recommend you all save before this gets taken down.
https://gilmore-global.com/catalogs/
Here are some specific links to the pdfs
1927
1931
1968
1978
1982
Here are date codes taken from roadsters.com
Year of Manufacture
A - 1933
B - 1934
C - 1935
D - 1936
E - 1937
F - 1938
G - 1939
H - 1940
J - 1941
K - 1942
L - 1943
M - 1944
N - 1945
P - 1946
Q - 1947
R - 1948
S - 1949
T - 1950
U - 1951
V - 1952
W - 1953
X - 1954
Y - 1955
Z - 1956
A - 1957
B - 1958
C - 1959
D - 1960
E - 1961
F - 1962
G - 1963
H - 1964
J - 1965
K - 1966
L - 1967
M - 1968
N - 1969
P - 1970
Q - 1971
R - 1972
S - 1973
T - 1974
U - 1975
V - 1976
W - 1977
X - 1978
Y - 1979
Z - 1980
Month of Manufacture
1 - January
2 - February
3 - March
4 - April
5 - May
6 - June
7 - July
8 - August
9 - September
10 - October
11 - November
12 - December
-Jose