German silver deck watch with largest movement Circa 1918

Silver watch with 40h power reserve indication
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An important, almost as new Glashuette deck watch, the largest by Lange ever produced 3/4 plate movement (Cal. 57)  with 40h power reserve indication in quality 1A, circa 1918. Silver case, engine turned, case design “Jürgens”, gold lateral hinge. Dial is matt silvered, sunk radial Roman hours, auxiliary seconds, 40h power reserve indication, blued spade hands. Very fine 3/4 plate movement, frosted, gilt, signed, blued screws, screwed gold chatons, oversized nickel steel screw compensation balance, blued balance spring with terminal inner curve, very finely engraved balance cock, index spring fine adjusting device, gold lever, gold-chatoned ruby endstone on lever and escape wheel.
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Diameter: 68 mm
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Weight: 271 g
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Signed: A. Lange & Söhne Glashütte B/Dresden