Stingray 50/60/70 Differences:
The difference is the bezel and the bezel styles available.
		The primary difference between the 50 and 60 is the size of the insert that they take but not the size of the bezel itself. The 50 takes a smaller insert and is designed around the first generation FF which had a much more balanced appearance.
		The 60 takes an insert with a larger outer diameter giving the watch the illusion of a larger bezel even though it’s the same size as the 50.
		The 70 is based on the later Polish Army Fifty Fathoms where the top edge of the bezel is beveled and in our case the knurling for the bezel is on the outer circumference.