Rolex Datejust Vintage the Deep Sea Alarm was

the Deep Sea Alarm was the first alarm watch meant to be worn underwater

IWC decided to modify the Portuguese even further

The objective of Mariner 3 and 4 was to flyby Mars and transmit data and images about the planet’s atmosphere and surface

a yellow gold and onyx cabochon crown

Rolex Datejust Vintage the Deep Sea Alarm wasSo called five digit Datejusts (reference variants with five digits) evolved from the original Oyster Perpetual Datejust line and are a quintessential staple of the Neo Vintage era. These models showed up in the late 70s and offer the added functionality of a higher beat movement for accuracy and a quick set date mechanism. They retain the classic 36mm case proportion of their predecessors and have similar variation for dial, bezel, and bracelet