1961 Rolex Day-Date 1803 Wideboy Silver Dial

The gold case back in 60-70's have 1-3 Hallmark depend on their production time: 1- 18k; 2- Queen head; 3 a balance weight with 750.
Box ❎
Paper ❎
Dial: Silver Single Swiss Door Stopper dial and AlphaHands 
Calibre: 1555 Automatic, 40 hrs Reserve
Condition: Mint and very strong case, with Radium lum 
 
This one hallmark case was produced in early 60's 800k case, 
don't get confused people says 2 mil case are bigger than 1 mil, but I have seen enough amount of watches so that I doubt that is the truth, there are indeed unpolished 1 hallmark case that is as thick as 2. But indeed the 3 hallmark case is bigger as they were shaped close to the next generation 5 digits.