Ben I don't think they were numbered, i don't see any numbers on the backplate and I also don't think they would still be available if they were numbered. Numbered pieces go faster than other non numbered limited pieces...you know that man lol.
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They are not serial #'d but when I bought them I emailed Manhattan Portage and one of their customer service reps said the watch was limited to 1,000 total pieces. This came directly from Manhattan Portage so I tend to believe it. I have also read this on another forum from another G Shock collector. I still have the email saved. I'm not saying its 100% without a doubt a fact but I doubt seriously a company rep would lie. They were $200 retail and that's pretty high for a 6900, even a limited edition. Heck the Eminem was only $180 retail and it's the XL 6900.
They have become a pretty hard watch to find. They rarely pop up on eBay and you will not find them in any stores. Manhattan Portage may still have a few but I doubt it. Casio doesn't release how many pieces are made on limited editions. I don't think most people are aware how few of this piece were actually produced.
Ill email them again and ask and get back with you.
HELP!!! I've been G-Shocked!