Swiss open faced one minute tourbillon pocket watch Circa 1930

Unsigned open faced nickel chrome tourbillon watch
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A Swiss keyless one minute tourbillon watch movement in a nickel chrome exhibition case, circa 1930. The watch features a gilded ½ plate movement equipped with a keyless lever escapement, mounted on a one minute tourbillon with a Better Type 1 carriage. The movement is unsigned. It has a silvered, two tone exhibition dial displaying black Arabic numerals, an outer minute ring, a sunken subsidiary seconds dial, and blued steel hands. The associated nickel chrome case has smooth, rounded bezels and a milled band, with glass on both the front and back.
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Diameter: 51 mm
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Signed: No name
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The movement is slightly tarnished and has some dirt. The hand setting operates smoothly. The dial shows small marks and scratches, but the two tone effect is strong and clear. The case has minor nicks and scratches, and there is some slight wear to the chrome plating in places; however, overall, the chrome plating is in good condition