This is a 36x44mm,14K pink and steel ROLEX Ref 6104 Big Bubbleback oyster OVEVTONE from circa 1952. According to some research about 1000 of these combined ref 6105 and 6104 Ovetone models were made. The ref 6105 model is with the coin/milled engine turned bezel and the 6104 model is with a smooth bezel.
This is the largest of the early Oyster Perpetual Models and this one is with Red date disc. The Ovetone model unlike the earlier and smaller Datejust is larger and is not distinguished by the name Datejust on the dial. The Ovetone Big Bubbleback is also distinguished by the ref numbers 4467, 6031 and 6105, 6104.
