Great looking, rare Omega Seamaster Calendar circa 1956 in stainless steel case with beefy lugs and tight fitting snap back with the etched words ‘Seamaster’ and ‘Waterproof’ still visible when viewed from an angle. Original 50’s signed winding crown is present. The dial is original and looks great, the crystal is new , has just been replaced. The cal 503 automatic movement is in excellent condition and was recently serviced by the previous owner, it has 2015 watchmaker mark inside. This movement was the first by Omega to feature a quick-set date, turn the hands past 12 to advance date, then back to 11 and back to 12 to advance again. Photos are not actual size of watch, the case measures 34 mm across (not including crown) x 42 mm lug to lug and is fit with a new leather bracelet.