All Of the common Sub hallmarks have been current in ‘fifty three: the black, luminous dial; the rotating dive bezel; the matching metal bracelet; the screw-down crown. And still. Watch nerds like Christie’s This was mainly a ref. 6538 — it even now showcased the 200m of drinking water resistance, https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/