Old 08-15-15, 06:57 AM
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cb400bill
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Originally Posted by dydaying
it seems to say 78A01065.
Your bike was the 1065th bike made in January 1978.

From our forum member T-Mar:

SERIAL NUMBERS 1976-1978*:

Serial number format YYXZZZZZ where:

YY = two numbers indicating the year of production
X = a letter, indicating the calendar month of manufacturer (A = January, B = February, C = March, etc)
ZZZZZ = a five digit number sequence, probably indicating frame number during month

Example: 77B13425 indicates the 14.425th frame manufactured during February 1977.
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