Reference
228238
Model case
Oyster, 40 mm, yellow gold
Water-resistance
Waterproof 
Bezel
Fluted
Dial
Green
Bracelet
President, semi-circular three-piece links
Movement
Perpetual, mechanical, self-winding
Calibre
3255, Manufacture Rolex
Power reserve
Approximately 70 hours
Certification
Superlative Chronometer (COSC + Rolex certification after casing)
 
 
Green Dial
Lacquer combines almost limitless freedom of colour with intensity and a smooth finish. The lacquering technique consists of successively depositing six thin layers of lacquer on a brass base plate. A colourless varnish is then applied to give the colour or shade all of its depth and shine. Once the varnish is dry, the surface of the dial is polished to magnify the colour; the dial is then ready to be pad printed and receive its appliques.
Rolex Day-Date in 18 ct yellow gold, m228238-0061 - Srichai Watch
Fluted bezel
The Rolex fluted bezel is a mark of distinction. Originally, the fluting of the Oyster bezel had a functional purpose: it served to screw the bezel onto the case helping to ensure the waterproofness of the watch. It was therefore identical to the fluting on the case back, which was also screwed onto the case for waterproofness, using specific Rolex tools. Over time, the fluting became an aesthetic element, a genuine Rolex signature feature. Today the fluted bezel is a mark of distinction, in gold on this Day-Date 41.
Rolex Day-Date in 18 ct yellow gold, m228238-0061