This is a 7 or 8-digit number laser-engraved onto the cone. This is the primary serial number used for verification.
Authorized dealers use a "Hologram Examinator" (a special viewing card) to check if the logo disappears correctly under specific filters. errbadmintonrestring.my country codes for a different region or more details on physical tests like the "twist test"? How to Check Real or Fake Yonex Badminton Rackets | ERR JB how to check yonex racket serial number
Note: If the numbers are printed rather than engraved, it is likely a counterfeit. This is a 7 or 8-digit number laser-engraved onto the cone
Day and Month of manufacture (e.g., 1504 = April 15th). Y: Last digit of the year (e.g., 3 for 2013 or 2023). X: Production line or revision number. errbadmintonrestring
Codes are often printed on top of the paint or use a font that is too bold or fuzzy. 4. Use Online Authentication Tools