Here is an old Packers long-sleeve durene jersey from the early-1970s that I recently added to my collection. It has a few nice repairs and also has stitch marks where the name plate was removed. Larry Hefner from Clemson wore #51 from 1972 through '75 which would correlate with the Sand Knit tagging that dates the manufacture of the jersey to that era.
Mark Hayne
Gridiron Exchange
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WANTED: WORLD FOOTBALL LEAGUE UNIFORMS