Originally bought it for use on Exp II and Speedy 145.012, but, I was eyeballing it and noticed that it fits this watch nicely as well, to my surprise! I then noticed that several other 20mm straps I have also fit it nicely.... which made be think - perhaps the lug spacing is more like somewhere between 19 and 20mm (and of course the materials of some straps are more flexible than others). I don’t have calipers but wouldn’t be surprised if the stated 19mm is a rounded number, as many are in this realm.