The GMT-Master II shares its case architecture with the Submariner underneath the extra hand, which is exactly what my measurements show: same 40mm steel construction, same 100m rating, same fundamental toughness — the complication adds a function without adding fragility. The Jubilee bracelet here is a genuine point of difference from the Oyster-bracelet references I've catalogued at this size; its five-link construction scores differently on my wrist-comfort axis, generally softer against the skin over long wear. At $18,750 it commands a real premium over the simpler GMT-less references in the lineup, which is the going rate for a second time zone done properly.