Chinese Abacus or Suan Pan wooden

pretty Chinese Abacus or suan pan made of a framework of wood, vertical bamboo rods (13) indicating units, tens, hundreds...; a central bar. Each vertical stem there are 7 wooden balls, 5 unary which are worth 1 and 2 quinaires, which are worth 5. Either 91 in any wooden beads. Back 2 flat crosspieces each showing 2 choke using backup. The Chinese Abacus is still widely used in many Asian countries. It is the symbol of order, concentration, address and method. Very beautiful decorative object. Dimensions: length 36 cm, width 17.5 cm; height 3 cm, weight about 400 gr