When I look at my racquets (Yonex brand) there are two sets of numbers. One is on the shaft and the other is on the cone. The one on the shaft is 7 digits and the one on the cone varys from 3 digit to 6 digits with two alphabets following the numbers.

I suspect the alphabets represents the location at which the racquet is sold, such as IN, or US, etc. It would be logical to assume the number right before the alphabets is the serial number of the racquet. Assuming the number is sequencial, not date coded or anything, that would mean the number of racquet manufactured for that particular type of racquet.

I couldn't figure out what the number on the shaft is for.

Any input?

Ben