Description (Catalog Card) : Weight (?) Black stone, with groove cut round the middle. Like U.1507, more elongated. Type III.
Description (Catalog Card) : [A-J] 10 weights. Hematite. Lentoid shaped. [A] 270 grains [B] 135 grains [C] 95 grains [D] 100 grains [E] 70 grains [F] 48 grains [G] 40 grains [H] 45 grains [I] 25 grains [J] 15 grains [later addition in pen=] (A) weight 6.11 ratio 2/3 s unit 9.16 (B) weight 4.225 ratio 1/2 s unit 8.45