Nice looking watch, Like Stuart said check out the seller and email them to ask some specific questions about the watch. If they are a reputable dealer they shouldn't mind answering a few questions.
I am a member of a watch BBS and they have helped me out a lot. I was shopping for a Accutron spaceveiw and found out people weare building fakes out of spare parts. If you are interested you could check that BBS out at
www.pmwf.com
I was SO close to buying a one of a kind B&M prototype watch but it was just a little too pricey for me.
On a side note, I'm working today but decided to celebrate the 4th by wearing my Tag Heuer... usually wear a Casio to work.