OP XII mechanical lever movement, 27 jewels, ivory dial, Arabic and luminous dot numerals, three subsidiary dials for constant seconds, 30 minutes and 12 hours registers, window for date, in large cushion-shaped water-resistant-type case, bezel calibrated for 400 units, two chronograph buttons in the band, crown protecting bridge with lever lock, screw back, stainless steel Panerai double deployant clasp, case, dial and movement signed