Era:
1947-55
Leather
Era:1964-66
Era:1966-68
No
'S' before 501.
'Made in U.S.A' appears
same as above but
lot number '0117' added.
Era:
1954-60 Paper
Era:1966-68
Era:1967-69
Changed to heavy
duty
'Lot' and 'XX'
disappear
'A,S,F' appear over 501
card stock due to expense
WPL 423 appears
as
as the factory uses
these
and washing machines
well as 100% Cotton
designations to sell seconds.
destroying leather ones.
'A=Good, S=Satisfactory,
F=Failure(seconds)'
Era:1969-1980
Era:1980-1983(est.)
appearance of 'care
last of the redline patches
instructions inside garment' 501 is
offset under
top printing.