See ChipGuide listing at:
http://chipguide.themogh.org/cg_chip2.php?id=MIDEWS

Weight designations include: Wills' Gem; also Wills' Super Gem in at least 2 designations: Regular Weight & Tri-Heavy Weight.

H.C. Edwards samples also show 3 weights:
http://chipguide.themogh.org/cg_chip2.php?id=NYNYHC&v=1359787504

Heavyweight; Extra-Heavyweight and Super-Heavyweight.

Some of the other old-time molds likely had weight varieties as well.