This is the Very Rare Bernina Walking Foot which is compatible with the Bernina Record Series of sewing machines such at the coveted 830 & 730, but will fit any machine that has a 5.5mm zigzag width and takes old style feet. 
This walking foot has been lubricated and fully serviced
The box does have some wear etc due to being 40+ years old
Bernina part number 0063275000