"MY MAN MATT" is the guy to go to. He is is Dallas,Texas. Has been building watches since 1985. He just put together for me my 'Ultimate Datejust'. It is a 16220 with a gen Rhodium Roman Dial, gen Crystal, gen Gasket, gen Engine-turned bezel, gen Crown, gen Swiss ETA 2836, on a Jubilee bracelet...and looks like a million bucks! Custom builds to your specs. Spends several days regulating the watch, high-pressure water testing (says I can dive with mine), and backs his work. Much preferred over the 'wham-bam-thank-you-mam' Chinese BS.
For what it's worth...