any changes are minimal and only to small details. this is also the case with the gmt-master ii, which received a high-tech ceramic bezel in . the ceramic bezel replaced the earlier aluminum bezels. ceramic has many advantages: it's especially hard, scratch resistant, and yet still very lightweight. dials...
no (persistent buzz) yes yes no (faint buzz, flicker on older rotary dials) yes brightness lost to heat % % % % % lifespan years years years years years warranty years years years years years retail price $ (two-pack) $ (two-pack) $ (six-pack) $ (two-pack) $ (three-pack) price per bulb $ $ $ $ $ payback...