It consists of a letter, A - L, followed by a 6 digit number.The letter stands for the month, A for January etc., the first 2 digits will be the year, 76 is 1976, 96 is 1996, the last 4 digits will be the consecutive production number for that months production, 1356 would be the 1356th guitar produced that month.
The first digit will be the last digit of the year, ie. The last 5 numbers will be the consecutive number denoting production count for the year with the caveat that each month will start at predetermined intervals of 3000 or 5000, etc.
- Cort serial numbers are denoted with a C prefix followed by either 7 or 8 digits.
I'm not sure what year the changeover occurred but using the formula it will be easy for you to tell.
This form of serial numbering is still used today on guitars where the number is impressed into the back of the headstock.
A761356 - The 1356th guitar produced in January '76 - These serial numbers will either be on the neck plate or on a serial sticker affixed to the back of the headstock, with some models still following the impressed old school serial numbers shown above.