Large hardwood abacus measuring 13" x 45" 1 1/2"
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Based on the photos and information provided, and subject to examination, this is:
An antique Chinese teak and ebony abacus
Probably 19th Century
13 inches high by 45 inches long by 1 1/2 inches deep
PROVENANCE: acquired at an estate sale
*represents a fair-market value for auction purposes; retail or asking price may vary.