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The identification number and the date of manufacture for the Holly are stamped into the forward vertical surface of the air horn. The code is broken down as follows. The first place is the last digit of the manufacture year. The second place is used for the month. The month was coded as a number 1 through 0 for January to October and then the letters A and B for November and December. The 3rd digit in the code is used to indicate the week of the month. There is a variation of the numbering system used for the Holley. This code was 4 digits and the first 3 are used to designate the day of the year and the last one was used for the year of manufacture.
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