Mike,
That's WD-1A, not WD-1, and it appears to be on a DR-8B reel, not a DR-8A reel.
WD-1 - two separate wires, usually twisted together very loosely, but not joined at all
WD-1A - two wires held together by the insulation, much like common household light cord wires.
DR-8A reel - has only one...