There is no answer to the question why El Primero was not used in the manufacture of this prototype – though perhaps it is because its cost was higher than that of the 146HP.
However, there were movement remnants in stock at Zenith, including the venerable 146HP, which may have been used in some projects including the release of an all-black prototype chronograph wristwatch with a blackened case, black dial and dark grey ‘ghost’ hands. Then, after developing the self-winding 1969 launch El Primero, they concentrated entirely on its manufacture until 1975, when Zenith made the decision to stop the production of mechanical calibers. Martel, as an industrial division of Zenith, produced this caliber in the 1960s. It is known that Zenith acquired this factory in the late 1950s. Some features raise questions, in particular the use of the manually wound caliber 146HP, produced by movement maker Martel Watch Co. The history of the appearance of this prototype has not yet been clarified in detail.
Zenith, when announcing in 2020 its vintage-inspired Chronomaster Revival ‘Shadow’ watch, drew attention to an unusual and rare vintage timepiece from the brand’s museum collection: “The Chronomaster Revival Shadow mimics the look of an obscure Zenith chronograph prototype from the 1970s that featured a blackened case.” The present example is one of the said ‘obscure Zenith chronographs’, which until then had not aroused the keen interest of connoisseurs. Functions – indication of time in hours and minutes, small seconds at 9 o’clock, chronograph with central seconds hand, 30-minute counter at 3 o’clock and 12-hour counter at 6 o’clock. Caliber 146HP, hand-wound, column wheel, lateral clutch, flat hairspring. Matte black dial, sub-dials with fine circular grooves, white markings, dark grey hands, tritium luminous dots in hour index positions, tachymeter scale. Case made of black PVD-coated metal, highly likely stainless steel, diameter 41mm, solid-steel caseback, stainless steel chronograph pushers and winding crown. Hand-wound chronograph movement, with a column wheel chronograph, simple index with a mobile balance-spring-stud-holder, Glucydur balance wheel with a flat spiralĪ highly rare, impressive and collectible black PVD-coated chronograph wristwatch prototype of the famous Swiss watch brand Zenith, founded in 1865. Black PVD coated case, with a stainless steel caseback, round stainless steel chronograph pushersīlack rubber strap, with a original stainless steel pin buckleīlack dial with luminous hour markers, white Arabic numbers, Tachymeter scale, 3 sub-dials, 30 minutes at 3 o'clock, hour counter at 6 o'clock, small seconds at 9 o'clock, chrome-plated hands
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