Egg Scale
Pic EGG DC 12

Egg and letter balance, also marked STS ( the trade mark of Samuel Turner Senior, Birmingham, England ) Cast iron frame in the shape of a horseshoe; aluminum plate dished in the center to hold an egg; graduated 0 to 4 oz by 2 dram; ivorine plaque carries postage rates, current from 1923 to 1940. Pendulum type, height 7,5"

There exist a version with a hangar, only for eggs.