Dude, you can't just ASK who ZF is. It's a bit like asking the Masons who the Grandmaster is. We don't know. Up in its high fortress of solitude on a Tibetan plateau, the monks of ZF factory wait. Nobody knows who, nobody knows where. All we do know is if you want to contact them, you have to go to your nearest creepy crossroads at night. There, you must throttle a baby lamb to death with your bare hands as you chant "C'THULU F'WAGN!!!!" 26 times. No more, no less. Then a hooded, mysterious stranger will arrive. He will make you sign a pact in your own blood which will be delivered post haste to your own door. Days later you will be forced to inscribe the model of watch you want onto your chest with a bare bodkin. If, and only if, you have accomplished these steps you will be asked to transcribe your bank account information to an anonymous Luxembourg safety deposit box via FedEx. DO NOT- I repeat- DO NOT use the postal service or UPS. We still have pictures of the remains of the last guy who tried it and they aren't pretty.
If this happens you will see your bank account charged. Your watch will show up at exactly 13:13 13 business days later. Be sure to be there to sign for the black car delivering it via masked messenger, and ONLY sign an X. It is imperative you sign an X or you will be endangering matter as we know it.
You've been warned. Use this power wisely, and with any luck you'll get a rep delivered safe and sound.
Definitely on my wishlist to buy it.