Longines Medical Chronometer Crown Wind 18 Carat Gold Pocket Watch
Longines Medical Chronometer crown wind 18 carat gold pocket watch. This lovely example in a step case states gradue pour 30 pulsations wich can measure a pulse. Simply, the Doctor starts the chronograph and stops it when the indicated number of heartbeats or breaths has been counted. The seconds hand will point to the number of beats or breaths per minute on the scale. Code 931ZAF.