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1921 (single)

red/black

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1922 (single)

black/white

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1923 (single)

white/dark green

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1924 (single)
script "SC" in circle
black/orange

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1925 (single)

white/green

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1926 (single)
"SC" inside Palmetto Tree design
green/white

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1927 (single)
"SC" inside Palmetto Tree design
green/white

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1928 (single)

black/yellow

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1929 (single)

black/white

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1930 (pair)
"IODINE" vertically on right side
white/black

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1931 (pair)
"THE IODINE STATE" bottom
green/gray

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1932 (pair)
"THE IODINE STATE" bottom
black/yellow

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1933 (pair)
"THE IODINE PRODUCTS STATE" bottom
black/white

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1934 (pair)
"APRIL 30" top or "OCTOBER 31" bottom
black/yellow(April) yellow/black(October)

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1935 (pair) 1/2 year
"APRIL 30" top or "OCTOBER 31" bottom
color variations:


red/white; white/red; black/white; white/black
no rhyme or reason known as to color variations

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1936 (pair) 1/2 year
"APRIL 30" top or "OCTOBER 31" bottom
yellow/black(April) black/yellow(October)

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1937 (pair) 1/2 year
unknown if APRIL exists - all I've seen are OCT
black/white

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1938 (pair)

black/yellow

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1939 (pair)

black/white

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1940 (pair)

yellow/black

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1941 (pair)

black/yellow

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1942 (pair)

yellow/black

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1943 (single)
restamped from collected plates - most '42; rare unstamped exist
no letter, assumed overflow of H-class
yellow/black

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1944 (single)
strip applied to existing 1943;
weight class matched, plate number did not
yellow/green

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1945 (single)
normal plate; no letter, assumed overflow of H-class
yellow/green

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