This ROLEX REF. 6305-2 is a LEFT-HANDED DATEJUST made of STEEL. This Oyster Perpetual DateJust, Officially Certified Chronometer has Serial number 110721 dating it to appx.1956. This watch has an automatic movement based on caliber 1030. The dial is “Swiss” only meaning that this is a Radium dial and the hands look like matching Radium hands. The bezel looks like a Turnograph bezel.
(picture from antiquorum.com)