Have a pretty rare (I believe, but you can tell me if I am wrong) Omega 3903. I am wanting to get a new crystal for it, but I haven't been able to find anywhere? The place where I get all of my vintage watches serviced said he looked everywhere, but no luck. Any suggestions?

 

Crystal is discontinued - you may be able to find a generic that is close and have it modified, but Omega no longer sells crystals for this case.