Finding the serial number on newer models: On most of our newer headsets, the serial number will be located on the inside of the headband on the Right (R) side, either printed directly on the inside of the headband or on a sticker.
I can't recall having seen the serial number visibly printed on any headphone I've owned. Against Counterfeit - Sennheiser Discover True Sound - Top-quality products and tailor made solutions.
