In our opinion the SD 4000 is one of the best investment sports pieces out there. Still (just about) 'under the radar' the 116600 was only made for 3 years and features a unique 40mm case, bezel, and dial, infact Rolex have never invested so much R&D in such a short production piece. Waterproof to 4000ft, fitted to a robust steel Oyster bracelet with excellent Glidelock clasp including built in dive extension link), this UK retailed example is in perfect conditon. Totally complete with its Rolex box, booklets, wallet, bezel protector and Rolex warranty card.