1940-51 Green Bay Packers

1940: Packers were a mix of solid navy socks and no socks at all.
1941: Packers wore no socks all season until 12/14/41 game in Chicago.
1942-43: Packers wore no socks for both seasons.

1940-51 navy is very dark.
1941-51 yellow pants are actually gold/khaki in color.

10/10/43 - DET @ GB (screenshot of NFL Films footage)

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1938-48 Detroit Lions

Color film of 9/24/39 Lions shows that the 1938-48 blue was a deep royal and the silver was brighter than predicted.

https://99wfmk.com/2019-marks-the-detroit-lions-90th-anniversary/

9/24/39 - BRK @ DET

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1942 Brooklyn Dodgers

In a Preseason game against "Ken Strong's All-Stars," the Dodgers allowed their opponents to use Dodger uniforms. In a game to sponsor the local New Brunswick (NJ) "Negro Servicemen's Center Fund," the Dodgers wore their own white helmets with red trim, their own red jerseys, and (in an unusual move) their own white pants with blue butt-stripes (typically worn only with their blue jerseys). Their opponents, dubbed Ken Strong's All-Stars, wore the blue Dodger jerseys along with the Dodgers' grey pants patterned with red butt-stripes. Their helmets were blue with white 'spider-stripes.' Presumably, this criss-crossing of uniforms was done to put both teams into red, white and blue patriotic themed uniforms.

9/20/42 - BRK vs Ken Strong's All-Stars @ New Brunswick, NJ

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1942 Pittsburgh Steelers

Steelers wore 1941 green jerseys over yellow pants with black helmets to better contrast the Bears' typical navy jerseys in a Preseason game.

9/5/42 - CHB @ PITT

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1942 Detroit Lions

Lions wore grey jerseys to play Western Army All-stars in 9/9/42 preseason game.

9/9/42 - Western Army All-stars @ DET

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1942 Brooklyn Dodgers

Pants were white with blue butt-stripes when worn with the blue jerseys.
(Screenshot courtesy of John Richards)

11/22/42 - BRK @ WASH

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1939-44 Washington Redskins

Front/back numbers larger, back numbers higher on shoulders.

12/13/42 - CHB @ WASH

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1941-42 Philadelphia Eagles

Front/back numbers made taller

10/19/41 - WASH @ PHIL

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1940-46 New York Giants

Improved size/position of front/back numbers.

9/28/40 - NYG @ PHIL

10/27/46 - CHB @ NYG

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1940-42 Pittsburgh Steelers

1940

Block numbers sized/positioned the same as 1939 numbers.

Added yellow-topped sannies.

1941

Made yellow jersey's numbers same as 1940.

Increased the sized of front back numbers to match what I saw in 1940 Eagles photos (green jerseys).

Green jersey numbers are pro-block but font is slightly bolder.

1942

Front/back numbers on yellow jerseys made identical size/position to 1941 yellow jerseys.

Front/back numbers on black jerseys almost identical in size. 

Back numbers higher on back than normal on black jerseys.

11/3/40 - PITT @ WASH

9/21/41 - PHIL @ PITT

11/8/42 - PITT @ DET

12/6/42 - PITT@ GB

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1940-43, 1945-49 Chicago Cardinals & 1944 Card-Pitts

Improved size/position/font of front/back numbers

Thickened 1948 pants stripes to match 1949

10/27/40 - CLE @ CHC

10/19/41 - CHC @ BRK

11/4/45 - CHC @ WASH

10/6/46 - CHB @ CHC

10/12/47 - CHC @ GB

12/5/48 - GB @ CHC

10/2/49 - CHB @ CHC

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1941-49 Green Bay Packers

Slight 2-toning for all years.

2-tone is front/back only for 1943-49.

1941-42 has darker 2-toning in elongated fly-area, also.

10/12/41 - BRK @ GB

12/6/42 - PITT @ GB

10/2/49 - LA @ GB

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