Lot of 3 old Mathema Sudel school abacus

Old school abacuses used to teach children mathematics. Probably 50s-60s. Mathema Sudel brand, engraved in the wood, as well as the words “registered brand and model”. 18 x 23 cm. Wooden frame with 10 rows of 10 multi-colored wooden balls on metal rods. They have been used and have numerous traces of use: ink stains, inscriptions of first names, numbers... See photos.

Ref. : KCUDXKR3