Wood abacus vintage plastic beads 80

Vintage abacus from the 70s/80s. Wooden base, metal branches, plastic beads. To our that it lacks a metal branch and therefore the 10 pearls that it wore. 10 pawns or beads per branch of 4 different colors red, green, blue and yellow. Dimensions: length 18.5 cm, width high 2 cm, bottom 5 cm, height 20 cm, weight about 230 g.