You're in NJ, why not just drive to NYC. There are a TON of watch dealers in NYC. I could get a referral from a guy that I deal with for Breitling if you'd like (he mostly deals in vintage Rolex or AP).
You could also do some research on
www.watchrecon.com
It brings watches in from a variety of forums and you can quickly do a search. The vast majority of dealers that are on these forums (WUS, TRF etc.) have really good reputations.
If they're a private seller, just ask for references. Most have great references and are easy to deal with.
If someone tries to pull a fast one on the forums, they're usually sniffed out pretty quickly and exposed.
Here are the results of a quick search for the Navitimer 01:
https://www.watchrecon.com/?query=br...01&last_days=0
And for the Navitimer GMT:
https://www.watchrecon.com/?query=br...mt&last_days=0