HI, my WK is the 37mm model(with my caliper it measures 37.13 and 38.82 to the crown guard), lug to lug is about 45mm, and my wrist is 6.5"; fits me very well, I think! My WAP model just arrived, also. It measures 39.38 with my caliper on the case and 40.94 with the crown guard. I hope that helps. Thanks.