I vote for the Stahly Live Blade, which was produced after WW2 and into the 1960s. I don't know how much it weighs, but I put mine on the floor scales and it moved. It's the one in the top middle; compare it to the Super Speed and Schick and you'll see what I'm talking about.
From my scale. Maybe not all that accurate but the readings are relative .
Toggle.......................... 87.8 gms
New Delixe Big Fellow...... 86.5 gms
195 Bottom Dial ............. 85 gms (Taken from the WIKI. I don't have one.
New Improved Big fellow . 83.6 gms
Fat Boy ......................... 82.2 gms
Old Type Bulldog ............. 65 gms
New Long Tooth fat handle 54 gms
Old Type Double Ring ....... 52 gms
Got to be the Stahly. Shaving with that thing is like doing a hammer toss. Much heavier than my Big Boy, Big Fellow, Toggle, Fat Boy and Barbasol - maybe as much as all of them combined...