Longines Swiss, Movement No. 8170561, Cal. 30CH, 37 mm, circa 1950

A gentleman's rare rose gold wristwatch with chronograph and pulsation scale - so called "Doctor's watch"
Case: 18k rose gold, push back. Dial: silvered, indexes/Arabic numerals, auxiliary seconds, 30 min. counter, blue tachy scale, red pulsation scale, baton hands. Movm.: 3/4 plate movement, rhodium-plated, "fausses côtes" decoration, finely ground chronograph steel parts, ratchet wheel, Glucydur screw balance.