How do you know if a Rolex watch is a 1601 model?

You can identify a Rolex 1601 model by checking the reference number engraved between the lugs on the watch case or by reviewing the model number on the paperwork that accompanies the watch. Additionally, the 1601 model is a Datejust model that features a date display at 3 o'clock and a classic Rolex design with a fluted bezel.