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Zenith has managed to take a movement developed in the '60s and continue to evolve it as a cornerstone of the company's contemporary lineup – this El Primero Stratos is a perfect link example of exactly that. At 45.5mm in diameter, this stainless steel beast link combines striking brushed and polished surfaces with a careful sprinkling of 18k rose gold accents through the case, crown, pushers, bezel, and link dial.

But, for now, it's difficult to define even broad serial number ranges for each dial type. There is so much overlap in the serial numbers these dials can be found in, link specifically link for Marks 2 and 3, that link I wouldn't doubt if the two were being produced side-by-side for a time.

This Longines "school" pocket watch is lot 31 of Iconeek's Timeless & Iconic Timepieces VII auction on link Friday, December 6, at 9 AM ET. The pre-sale estimate link is 20,000 link to 40,000 CHF. Click here for the full listing.

This is a 42mm diver equipped with the brand's three-handed chronometer-certified BE-92AV movement. As a dive watch it is rated to 300m and features an internal bezel operated by the four o'clock crown. There link are two link color variations in link the new bronze line differentiated by a black or a blue dial each maintaining red flourish on the seconds hand. Both watches come equipped with a color-matched sailcloth strap.