Era 1966-1975 No weight on private plates; "P" prefix optional for private trucks with no weight (began 1967)  white/blue   blue/white few with smaller font   begin reflective letters white/black  white/blue   "1670 300 YEARS 1970" white/green   white/brown  white/black  white/blue weight codes discontinued; previous "H" truck get regular random-issue  last year for pairs white/green  white/maroon Era 1976-1981 all single plates  "1776 Bicentennial 1976" top blue/white  red/white  green/white  black/white 1980 blue/white  red/white < back to 1960-1965 | No letter prefix; Weight stamped left side              1/2 year changes to May 15 First year??  
essentially same as above, but high weight codes receive leading letter        1/2 year changes to June 30 First year??   > forward to 1982-present |
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