Accompanied by a Rolex wooden presentation box, product literature, and outer packaging.
Launched in 1988, the 16500 series comprised the first automatic chronographs to be introduced by Rolex, marking an end to the production of hand-wound Daytona models. The series initially used a modified Zenith El Primero movement, which was later replaced by the 4030 caliber developed in-house by Rolex. This new movement was itself based on Zenith's caliber 400 and contained about 200 modifications.
The 16500 series comprises the 16520 in stainless steel, the 16523 in steel and gold, the 16518 in 18K gold with leather strap, the 16519 in white gold with leather strap and the 16528 gold model. All models are water-resistant up to 100 meters, come in Oyster cases with screw down push buttons, have an Oyster Triplock 700 series winding crown, a calibrated metal bezel and sapphire crystal.
For other examples of the Rolex 16500 Series, see lots 173, 174, 269 & 270 in this sale.
For detailed descriptions and illustrations of the dial variations of the 16500 series see Rolex Daytona - A Legend is Born by Carlo Pergola, Stefano Mazzariol, Giovanni Dosso, pp. 207-227