Wooden Abacus 1:5 / 21

Wooden Abacus / 1:5 ratio / 21 columns / ~1950s […]

Post stamp Soroban 1987

Post stamp / 5 colors / Soroban 1:4 / The […]

Soroban 1:4 / 13

Vintage Soroban 1:4 / 13 columns / Wooden frame and […]

Book Abacus Arithmetic

Abacus Arithmetic – How to Perform Some Calulations on the […]

Abacus Solid Brass 2:5

Vintage Abacus / Suanpan 2:5 / 9 columns / Brass […]

SHARP EL-8048 / 13

Brand SHARP / ELSI MATE EL-8048 / NO. 188 / […]

Book Soroban in America

Soroban in America / Author Belva Sullivent Martinez (California, US) […]

Book Principles Chinese Abacus

The Principles and Practice of the Chinese Abacus / Author […]

Book Advanced Abacus Theory

Second book of Japanese Abacus Theory & Practice / Author […]

Post stamp Suanpan 2:5

Chinese / Post stamp Liberia, Africa