Vintage 1960s Calypso Dive Depth Gauge Aqua Lung Aqualung

Calypso Aqua Lung dive depth gauge vintage 1960s. Function: This analog gauge measures depth during scuba diving, indicating readings up to 200 feet (or approximately 60 meters). Manufacturer: It was produced by U.S. Divers Co., a well-known name in diving equipment, under their "Calypso" and "Aqua Lung" lines. Mechanism: The depth is measured by pressure differential using a Bourdon tube, with a small opening on the side of the case allowing water to enter the tube. *One side of band missing*