I found in this forum there are three rackets made on the same day (one of the racket is mine). I wonder if anyone has idea on how to dissect the cone code: Racket 1: 9216031 180302SP Racket 2: 9214281 180302SP Racket 3: 9213492 180304TW Thanks.
The digit after the year (2, 2, 4 for three rackets) is interesting. It is not in the same order of serial number. So it might be not a batch code.
It could be that the final digit is the factory where it is produced. It may be that the factories are each allocated numbers for the days production (hence why it seems not in order). Either way it shows there are at least 2,500 rackets made a day!