Swiss stainless steel antimagnetic pocket watch Circa 1920

Stainless steel lever with chronograph
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A fine and rare Swiss, stainless steel, an antimagnetic keyless pocket watch with chronograph and central progressive 60-minute register, circa 1920. A polished case, co axial button in the crown for start/stop and return-to-zero of the chronograph. Hinged nickel cuvette.
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Two-tone silvered dial, black Arabic numerals, outer minute track, outermost fifths of a second division with Arabic five-second numerals, subsidiary seconds. Blued steel feuille hands, red minute counter hand. A rhodium-plated movement, Geneva striping decoration, 19 jewels, straight-line lever escapement with gold pallet fork, monometallic balance, self-compensating Breguet balance spring, index regulator. Dial, case and movement signed.
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Diameter: 51 mm
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Signed: Longines  Swiss