GE drum switch CR102A13.  This is identical to the common CR102A1 switch except that one position is momentary (jog) instead of fixed.  It's currently set so the reverse direction is momentary, but it can be configured either way.  Instructions are inside along with the wiring labels.  Contacts are in good condition.  From the estate of an engineer; can't tell if it was lightly used or just spent a lot of time in his spare parts box.  Single or multi phase, up to 600VAC, 2HP.