Most promptly apparent are The dearth of crown guards and the Particularly thin case. The crown is likewise significantly compact, at 5.3mm. Beginning manufacturing at the same time as being the ref. 6200, the Submariner ref. 6536 returned to your thinner situation and smaller crown (and 100m drinking water resistance) https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/