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First issued 1917.
"Z" prefix used 1919-present
    all numeric >1000 in the 1940's
"Zx" began approximately 1998, where 'x' is a letter, issued in alphabetical order
    (A is excluded; used for Antique)

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1917

black/light yellow

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1918

white/green?

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1919

blue/white?

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1920

white/dark green?

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1921

red/black?

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1922

black/white?

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1923

white/dark green?

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1924

black/orange?

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1925

white/green

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1926

red/white?

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1927

green/white?

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1928

black/yellow?

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1929

black/white?

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1930

white/black?

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1931

green/gray?

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1932

black/yellow?

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1933

black/white?

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1934

yellow/black?

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1935

unknown

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1936

black/yellow

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1937

black/white

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1938

black/yellow

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1939

black/white

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1940

yellow/black

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1941

black/yellow

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1942

yellow/black

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1943

black/yellow

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1944

yellow/green

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1945

yellow/green

presumably, Z-prefix was standard, but removed after plate number 999

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1946

silver/black

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1947

black/yellow

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1948

yellow/black

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1949

white/black

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1950

black/white

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1951

white/black

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1952

yellow/black

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1953

black/yellow

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1954

white/black

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1955

black/white

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1956

black/yellow

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1957

white/blue

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1958

blue/white

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1959

white/blue

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1960

blue/white

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1961

red/white

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1962

white/red

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1963

white/green

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1964

white/black

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1965

black/white

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1966

white/blue

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1967

blue/white  (motorcycle size standardized to 7"x4")

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1968

white/black

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1969

white/blue

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1970

white/green

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1971

white/brown

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1972

white/black

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1973

white/blue

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1974

white/green

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1975

white/red

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1976

blue/white

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1977

red/white

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1978

green/white

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1979

black/white

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1980

blue/white

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1981

red/white

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1982
"EXP. 11-30-82" bottom
green/white

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1983
"EXP. 11-30-83" bottom
black/white

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1984
"EXP. 11-30-84" bottom
blue/white

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1985
"EXP. 11-30-85" bottom
red/white

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1986
"EXP. 11-30-86" bottom
green/white

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1987
"EXP. 11-30-87" bottom
black/white

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1988
"EXP. 11-30-88" bottom
blue/white

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1989
"EXP. 11-30-89" bottom
red/white

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1990
"EXP. 11-30-90" bottom
black/white

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1991
"EXP. 11-30-91" bottom
green/white

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1992
"EXP. 11-30-92" bottom
blue/white

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1993
"EXP. 11-30-93" bottom
red/white

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1994-1995
"EXP. 11-30" bottom, passenger sticker
green/white

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1996-2015
blue/white
 passenger month & year stickers used
    at Z99999, ZB1001 issued (ZA skipped, used for Antique prefix)
    at ZZ9999, stacked prefix Z/B10001 issued
       (Z/B and SOUTH CAROLINA screenprinted flat)

  a batch of "ZX" plates were made with black numbers
      unknown if this was an error, or intentional
         possibly done to distinguish between Dealer (XZ prefix)

Full plate transitioned to flat (digitally produced numbers) at about Z/B38000

in use through 4/30/2017 if continuously renewed

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2015-present

blue/red stripes at top, black/white

 passenger month & year stickers used

  Redesign effective 5/1/2015
  Full replacement complete by 4/30/2017