Winter poses many concerns on the watch wearer — practical, sartorial and in some cases technological queries. Similar to the ref. 6536 higher than, it had been offered in either chronometer and non-chronometer variants, but this was The 1st time the COSC watches basically experienced the 'Formally Qualified Chronometer' textual https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/