Thank you for another interesting post about subtle differences within the same reference!
It’s fascinating how these small changes go in over time. Not a nautilus, but other references also has these small differences. Below is my 5127 with 57 dots around the dial on the left, but newer runs of the 5127 has 60 dots around the dial (note there are 3 more on the date window). The newer 5127’s also use the 324 movement, as opposed to the the old ones that has the 315 movement. I wonder if there are 5127’s with 60 dots that has the 315 movement, or if all with 60 dots only has the 324 movement.