Winter poses a number of inquiries into the watch wearer — simple, sartorial and from time to time complex issues. Starting production concurrently as being the ref. 6200, the Submariner ref. 6536 returned to some thinner case and more compact crown (and 100m h2o resistance) but was supplied the Cal. https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/