
The 1972 patch on the left has "STEELERS" in all caps while the 1973 patch has "Steelers" in a lower case stencil font.
In 1974 the facemask changed from single bar to double bar:

while the 1975 issue added TMs (although its hard to see against the dark green background):

The 1976 series added a yellow border around the helmet patch as well as had the matching Hi-Gloss helmet sticker:

The Packers logo patch was the same for 1972 through 1974 (top left), followed by the addition of TMs in 1975 (top right)

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