Hi Timothy,

Thank you for contacting Mearto with your appraisal inquiry.
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
$300-500*
*represents a fair-market value for auction purposes; retail or asking price may vary.