Eterna watch pulsometer 1942 a medical instrument and effective timepiece eternas pulsometer was by 1942 demonstrating its usefulness on the wrist of medical doctors and nurses the great timepiece returned in 2010 this time equipped with a self winding mechanical movement providing 42 hours of power reserve and fitted in a stainless steel case 42 mm across each of the 1 942 timepieces has its number engraved on the caseback professional caregivers and historians alike will be happy to see