Winter poses numerous inquiries towards the watch wearer — useful, sartorial and at times complex thoughts. Such as the ref. 6536 previously mentioned, it absolutely was readily available in possibly chronometer and non-chronometer variants, but this was The 1st time the COSC watches in fact had the 'Formally Qualified Chronometer' https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/