Swiss stainless steel chronograph deck watch Circa 1925

Open faced chronograph by Meylan
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An absolutely rare Swiss stainless steel open faced chronograph deck watch, circa 1925. Movement with high speed balance, lever escapement, polished screws, engraved balance cock, visible ruby ​​jewels, 15 jewels. White enamel dial with red and black Arabic numerals, outer digit ring shows the stop second 1-30 and 31-60, blued hands. The pointer takes 30 seconds for one rotation, this allows the indicators to stop to the tenth of a second exactly. Start, stop and zero with a pushbutton in the pendant. Plain case.
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Diameter: 52 mm
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Weight: 96 g
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Signed: A.R. & J.E. Meylan Swiss