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.
An Ibanez serial number can tell you two things, year of manufacture and factory [or country] of manufacture.
If you're trying to figure out what model something is from the serial number, figure out what year it is then go to the catalog library for the corresponding year [or year before or after] to find the model.
Some models will never be found in the catalogs, that's just the way it is.
Here is the breakdown courtesy of Ibanez Collectors World.
Until 1977 Maxon used 5 digit serials: 1st character is a production code (1,2,3, etc., maybe related to different production location) 2nd character indicates the year of production (2=1972, 3=1973, etc.) 3rd character indicates the month of production (0=January, 1=February, ...
Post 11/2011 they changed to alpha, 4 numbers, alpha, the first letter being the month, A for January, the last being the year, B for 2011, C for 2012, etc. - The Guitar Dater Project will decode W, S, I and who knows what other prefixes [factory codes].
I do not know how accurate the system is but the few I've run have worked just fine. Plate serial numbers have nothing to do with headstock serial numbers.- Under the old numbering scheme 1997 would show duplicate numbers to 1987 so the serial number was changed to the F and 7 digits, now the first 2 denoting year of production. 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. With production year beginning in November - 00000 - Shown as F for Fujigen in the examples above, other factories used that mainly produced the budget models were C for Cort [Korea], S for Samick [Korea], W for World [Korea], and guitars are also built in I Indonesia, China, and who knows where else.These serial numbers are usually quite different from the MIJ numbers, have many extra digits because of the enormous volume of guitars produced, and I am not familiar enough with any of them to tell you how to figure out the dating.Ibanez did not put serial numbers on their guitars. The only way to date these guitars is to find out what years they were available and then comparing all the minute details like scripts, contours, and inlay variances that only the hardcore vintage gurus know.These guitars can be dated by their electronics if they are original.There are many variables of numbering through these years and between different models and are broken down into 3 categories, stickers, plates, and the impressed numbers that follow the old school style detailed above.