The "great sword" weight ITL 109 is from a fnording parade sword.
To rescale we'd have:
Knife (1d-2), ST 6, 0.25 pounds
Dagger (1d-1), ST 8, 0.5 pounds
Main Gauche (1d-1, stops 1 hit, no DX penalty if Fencer), ST 8, 1 pound
Rapier (actually Smallsword) 1.5 pounds
Sabre 2.0 pounds (US military is 23 oz, but of modern steel)
Shortsword (Gladius) 2.5 pounds is slightly heavy.
Broadsword 3 to 5 pounds historically, but anything above 3 should be considered another category.
Bastard sword 4 pounds
2-handed sword 6 pounds
Greatsword 8 pounds