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1967 through 1969 HolleyThe identification number and the date of manufacture are stamped into the forward vertical surface of the air horn. The three digit date code is broken down with the first number being the year of manufacture, the second number (or letter) being the month of manufacture (1 through 0 for January through October, and then the letters A and B for November and December), and the third number being the week of the month. Service parts assembled 1973 or later will have four digit date codes.
Did you read the link Darrell posted?