Cartridge without serial?

@chakster where you get thousands of cartridges being manufactured of the same type and then being distributed is questionable. If a company like Zyx is selling and distributing thousands of cartridges into the world market at anytime, not only would that impress me , but would place me somewhat in disbelief. The whole high end market for a hand built Japanese cartridge, considering the competition and overall demographic of potential customers must be very small...so that even selling hundreds per year would be a significant accomplishment, imo. If you know differently, please point us to this information.

stay away at all cost it is a  fake.

@daveyf I'm tired arguing with you, if you think a manufacturer like ZYX and its designer Nakatsuka-San with at least 50 years experience in cartridge manufacturing can't make a thousands of cartridges nowadays under his own brand then high-end market must be completely dead. But again, they sell them all over the world, USA is a huge country, they sell in Russia, China and whole Europe ... Also they make so many different models from expensive to very expensive.  

@chakster  LOL, If you think that ZYX or any high end manufacturer of cartridges, with the possible exception of Ortofon, is making and selling ’thousands’ of cartridges annually, i have a nice bridge I can sell you....

I found a pic of the serial number on the back of my cartridge.
It reads C3724 and it doesn`t match the serial number on the booklet.
Interesting...