The 'Rolex ref. 1630 was introduced a few years earlier than the Oysterquartz as its predecessor. From a quick glance, from a case and bracelet standpoints look similar to the Oysterquartz. There are two automatic versions
namely the stainless steel version of this watch was named Oyster Perpetual Date ref. 1530, the two-tone version bears the name Oyster Perpetual Datejust ref. 1630

