Roman Hand Abacus STL - Ancient Counting Board Replica

A flat, rectangular counting board in the style of a Roman hand abacus. A raised frame surrounds two recessed fields separated by a raised bar: the upper field has one bead in each column and the lower field has four beads per column, across eight columns. The beads are fixed in place. Surviving Roman hand abaci were small bronze plates with slots in which beads could slide. Each main column typically had one upper bead worth five and four lower beads worth one each, allowing quick calculation…

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