Rare English brass deck chronometer with power reserve Circa 1950

Brass marine deck watch
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A rare English eight day marine deck chronometer with power reserve indication, circa 1950. Supplied by Johan Gulbransen, Oslo, Norway. Brass bowl with screwed down glazed bezel, gimbaled in a three tier mahogany box, the central section with applied supplier’s signature plaque, glazed top and hinged lid, brass handles. Silvered dial with radial Roman numerals, outer minute track, subsidiary seconds, power reserve dial below 12 with blued steel spade hands.
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Brass half-plate movement, ring turned pillars with blued steel screws, fusee and chain with Harrison’s maintaining power, Earnshaw’s spring detent escapement mounted within two smaller circular plates, cut bimetallic compensation balance with cylindrical weights, temperature adjustment screws and meantime adjustment nuts, free sprung special alloy helical balance spring with terminal curves.
Dial and box signed dial and box are numbered.
Outer box 250 x 250 mm, inner box 185 x 190 mm.
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Diameter: 130 mm
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Signed: Thomas Mercer  St. Albans
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The case and dial have some transformations.