this is a handwound a277 supersubsea from the late 1960s in all original condition. the 40mm steelcase is in great shape, coming on the original Zenith/gay freres ladder-bracelet with zf endlinks. lume on dial, in hands and in the bezel is still the original tritium one. the beautiful zenith 146 hp caliber has been checked through and is running perfectly in all functions.