High-quality Swiss gold open faced dress watch Circa 1961

Gold dress watch by Longines
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A rare high-quality Swiss 18 carat gold open faced dress watch, circa 1961. Rare movement quality. Silvered dial with gold indexes and black outer minute divisions, subsidiary seconds, gold hands. Plain case. Dial signed, cuvette and movement signed and numbered. Comes with an old leather box.
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Diameter: 47.5 mm
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Weight: 64 g
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Signed: Longines Swiss made
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Longines used the rare calibre 37.9 for dress watches as well as for wristwatches, for example for the rare pilot’s watches Ref. 6630. The calibre 37.9 was equipped with centre seconds and 37.93 with subsidiary seconds.