First issue 1921, when Weight Codes introduced.
All plates expired October 31 of year marked. 1/2 year same as passenger 1934-1936; Earliest truck-specific 1/2 year known 1956.
Plates marked with TON but no leading letter believed to be Trailer (prior to 1965)
Restamped plates known 1943, 1948, 1951
jump to modern era: 1982-present
weight-based letter coding used 1921-1971
1921 (single)
red/black
1922 (single)
black/white
1923 (single) variation known without dash
white/dark green
1924 (single) script "SC" in circle
black/orange
repainted; should be orange
1925 (single)
white/green
1926 (single) "SC" inside Palmetto Tree design
green/white
1927 (single) "SC" inside Palmetto Tree design
green/white
1928 (single)
black/yellow
1929 (single)
black/white
1930 (pair) "IODINE" vertically on right side
white/black
1931 (pair) "THE IODINE STATE" bottom
green/gray
1932 (pair) "THE IODINE STATE" bottom
black/yellow
1933 (pair) "THE IODINE PRODUCTS STATE" bottom
black/white
1934 (pair) "APRIL 30" top or "OCTOBER 31" bottom
black/yellow(April); yellow/black(October)
1935 (pair) 1/2 year "APRIL 30" top or "OCTOBER 31" bottom
white/black (April); black/white(October)
1936 (pair) 1/2 year "APRIL 30" top or "OCTOBER 31" bottom
yellow/black(April); black/yellow(October)
1937 (pair) "OCTOBER 31" bottom
black/white
1938 (pair)
black/yellow
1939 (pair)
black/white
1940 (pair)
yellow/black
non H, opposite colors?
1941 (pair)
black/yellow
1942 (pair)
yellow/black
1943 (single) restamped from collected plates - most '42; rare unstamped exists
yellow/black
1944 (single) strip applied to existing 1943;
weight class matched, plate number did not necessarily
yellow/green
1945 (single)
yellow/green
1946 (pair)
silver/black
1947 (pair) some restamped known (shown)
black/yellow
1948 (pair) some restamped known (shown)
yellow/black
1949 (pair)
white/black
1950 (pair)first year actual weight marked on plate
black/white
1951 (pair) some restamped know (both shown)
white/black
1952 (pair)
yellow/black
1953 (pair) begin P-prefix for variable weight (Commercial vehicles); other letters for Private vehicles
black/yellow
1954 (pair)
white/black
1955 (pair)
black/white
1956 (pair)
black/yellow
1957 (pair)
white/blue
1958 (pair)
blue/white
1959 (pair) H numbers >99999 no "1TON"
white/blue
1960 (pair) last year for J, L, N, etc prefixes
blue/white
1961 (pair) last year weight marked on plate (H only)
red/white
1962 (pair)
white/red
1963 (pair)
white/green
1964 (pair) begin 2-letter prefix, (overflow from single letter)
white/black
1965 (pair)
black/white
1966 (pair) P-prefix dropped, but still considered Commercial
white/blue
1967 (pair) transition to smaller font;begin P-prefix for private/weight-based tax
weight-marked considered Commercial
blue/white
1968 (pair) begin reflective letters
white/black
1969 (pair)
white/blue
1970 (pair) "1670 300 YEARS 1970"
white/green
1971 (pair) last year of "H" class indicator
white/brown
1972 (pair) previous "H" truck get passenger random-issue or "P" prefix for weight-based tax purpose
white/black
1973 (pair) 1/2 year changes to May 15th
white/blue
1974 (pair) last year for pairs
white/green
1975 (single)
white/maroon
1976 (single) "1776 Bicentennial 1976" top
blue/white
1977
red/white
1978
green/white
1979
black/white
1980 1/2 year changes to June 30th
blue/white
1981
red/white
