The school model of differential gear from 1960/70s - very rare, the model was produced by Biofiz Poland, Factory of teaching aids in Poznań, Poland. This object is completely efficient, it's in its original, good condition. The model is made of steel, wheels are made of bakelite, rubber and steel. Measures: height 33 cm width 43 cm depth 22 cm weight 4,6 kg Shipping: the model will be securely and precisely packed and sent by courier with insurance and tracking.