I just bought a disc fork to make one of my 700c commuters into frt dyno/disc, it weighs 1200gm, the non-disc fork it's replacing is 900gm. So the disc set up is 570+155+105+15+1200 =2045gm and the Sturmey dyno/drum is 1220+ 900 = 2120gms.

My SA weight included axle nuts, the Alfine weight didn't include a QR, that's another 60gm.

Looks the the SA is 15gms heavier....