Swiss stainless steel pocket watch with chronograph Circa 1966

Steel chronograph with 30-minute counter by Patek Philippe
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An important and extremely rare Geneva sports chronograph with a 30-minute counter and an extract from the Patek Philippe archive, circa 1966. According to general knowledge, no more than 30 copies of this reference were made.
Bridge movement, Glucydur screw balance. Silver-plated dial with applied indices, Arabic numerals, centre chronograph hand, dial for the seconds, subsidiary dial for the 30-minute counter, and baton hands. Polished plain stainless steel case, screw back. At six o’clock, there is a square-shaped eyelet so that the watch can be worn on a strap around the neck. Dial and movement signed.
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Diameter: 46 mm
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Weight: 77 g
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Signed: Patek Philippe
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Reference 840 was produced from 1951 to the late 1960s in a small series of only about 30 copies. To date, fewer than ten of them are known to experts. The rare sports chronograph is equipped with the well-known 13” chronograph movement, which was used in all wrist chronographs of the time. The silver-plated dial has black, clearly raised scales and the Patek Philippe lettering in the centre, as well as applied, silver-coloured indices and Arabic numbers. At six o’clock, there is a square-shaped eyelet so that the watch can be worn on a strap around the neck. A screwback protects the movement from the weather when measuring time outdoors. This makes it the only pendant/pocket watch with a screw back ever made by Patek Philippe.