Yonex has transitioned to a purely numerical system for newer models. Instead of two letters like "SP," you may see 4-digit regional codes (e.g., 3542 for Japan, 1142 for the UK). 3. Verify Authenticity How to know if your Yonex Badminton Rackets are Authentic
: one on the shaft and one on the cone above the handle. You can decode the production date and country of distribution directly from the cone's serial number. Khelmart.com 1. Locate the Serial Numbers Shaft Serial Number how to check yonex racket serial number