Originally Posted by HexHead
The Oyster Perpetual, AirKing and Date models are 34mm. The DateJust and original Explorer are 36mm.
Midsize Datejusts are 32mm and the Ladies DateJusts are 29mm. Ladies YachtMaster is 32mm (my wife has one).
If you refer to the website, the Oyster Perpetual can be had in 26 (lady's), 31, 34, and 36mm. The 34mm models are the Air-King. The 36mm model can be had with either the smooth steel bezel or a fluted white gold bezel. Just going by the website, looks like you have to step up to the Datejust if you want the yellow gold fluted bezel (and two-tone bracelet).