Stamps
Scott: 1123 A349
Scott:
Over the years many devices have been used to speed mathematical calculations. From the abacus, and napiers bones, to the ubiquitous computer of the 21st century.
| Stamp | Description |
|---|---|
|
Germany, 40pf, 1973 Scott: 1123 A349 |
|
United States of America, 33 cents, 2000 Scott: |