Rolex Datejust

The Datejust is the best selling Rolex model on the market, and has been for decades. It was first introduced in 1945. The gents model is 36mm in diameter and typically came on a Jubilee bracelet. Rolex seems to have changed their tradition on this, and is sending more Datejust models out the door with the Oyster band. Models with smooth bezels exist, but are more scarce. Most have the fluted bezel, which is 18k white gold on the steel model.
The Datejust was only available in gold until 1957 (conveniently a year after the release of the Day-Date which still has never seen a steel model). The steel Datejust was introduced and became an instant success. Rolex soon saw the steel variations selling much quicker than their gold models. Rolex countered this in 1962 when they introduced the gold and steel version.