Swiss gold dress watch with agate stone case Circa 1920

Agate stone-cased pocket watch by Longines
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A fine and rare Swiss, keyless, blue banded agate dress watch, circa 1920. A yellow gold bezel and pendant. White enamel dial with blue Roman numerals, outer minute divisions, recessed subsidiary seconds dial. Blued steel Spade hands. Movement, 17 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel balance spring. Dial and movement signed.
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Diameter: 53,5 mm
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Signed: Longines  Swiss