Antique Japanese Kanban soroban (abacus). Used by merchants, this large sized abacus has eyelets for hanging. It has 21 rows of wooden beads with 5 beads in each column (105 beads total). The beads are fitted onto wooden dowels. Behind each dowel is a boar's hair bristle which holds each bead in position when it's pushed upward even while the soroban is hanging sideways.

Showa Period (early-mid 20th century)

Dimensions: 43" wide x 12" high x 2 1/4 deep.