vintage Bosch SSH507/12 rotary switch

Old Bosch rotary switch # SSH507/12 in used condition. The switch is without dents and the handle is very good. The switch is not tested and I did not open it. The rear is stamped with "Bosch, SSH507/12, 51". The black knob is stamped with "BOSCH" and the "face" has number "0 0 II II" stamped. The switch can be rotated 360 degrees. There is no clicking noise when turning, nothing clicks into place. The rear diameter is about 3,1 cm. The knob is about 3,5 cm length. Made in Germany.