Swiss miniature competition observatory chronometer Circa 1940

Extremely rare miniature watch in a wooden block by Longines
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An extremely rare Swiss miniature competition observatory chronometer in a wooden block observatory case, circa 1940.
Polished steel case. Signed silvered dial with radial Arabic numerals, outer minutes track, subsidiary dial for the seconds, and Breguet hands. Divided 3/4 plate movement, gold screw compensation balance.
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Diameter: 27 mm
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Weight: 20 g
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Signed: Longines
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As far as known, this is the smallest chronometer Longines has ever offered for testing.