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Here is a very uncommon vintage 1970 dive watch that could be the LARGEST vintage dive timepiece EVER produced for mass market in that era! This ROYCE AUTOMATIC PROFESSIONAL MARINE with screw back measures an awesome 46×62.5mm. lug to lug. From what limited information we are able to ascertain; these watches were produced for professional divers and were mainly used by the FRENCH navy. We have another in our own collection, both were purchased from France; further validating this claim. The base metal anodized coated case and hooded lugs are moveable (flexible). The bezel with inset minute markers in black Arabic 10 minute interval markers is unidirectional; preventing the diver from turning the bezel backwards if bumped. This further demonstrates its’ “professional” design. The all ORIGINAL black dial is unbelievably vibrant with green luminous markers that still glow, as do the hands and sweep seconds. The orange inner bezel with 15 minute interval and minute markers provides further contrast. The underwater readability must have been second to none with this piece! The original mineral glass crystal is pristine. The automatic winding signed ROYCE movement is produced by AS and is accurate. Notice the recessed crown protected and inset in the top lug; further reducing water penetration in the event the crown is bumped. This incredibly collectable ROYCE DIVE WATCH has minor wear. . You will see how fabulous and clean it presents itself on the wrist! We have also learned that Le Jour produced this identical watch.