Somewhere along the way I picked up a Leeds & Northrup bridge made for Western Electric. It's a KS-10376 Null Voltage Test Set. Unfortunately the galvanometer was dead. The coil is open. It's probably burnt out.
The horseshoe shaped piece is the external magnet.
The coil is inside the meter assembly. I haven't tried to open it up and look at it. It'd be a challenge to rewind the coil.
Here's how it looks all together.
Anyone want it? It's yours for the cost of the postage to get it to you.
Gone to someone who needed it for a L & N bridge as a display piece.