Correct, v1 has older (thinner) 1600 shape - now v2 16000 case shape.Sure. Out traveling so cannot provide any pictures at this time but from memory the main differences vs my 1600 are: bezel on v2 looks wider and bigger groves, case thicker, caseback thicker.
Cannot comment on lug shape, nothing that significantly stood out to me.
However, as Dr.Vintage’s case I based on 16xxx these differences to me appear consistent with the model upgrade.