Unlike most answers I've found, this valve is not leaking at the seat washer. I still replaced that since I had the valve open. I tried putting some packing inside the concentric nuts, the silver one that holds the cover and the bronze one that the silver one goes into. Still I cannot stop the drip which only happens when the valve is opened to run the water.
The only discernible markings are around the stem with the word WOLVERINE stamped into the metal.
Here is a picture of the valve stem for further reference:
And here is a picture of the manifold the valve goes into behind the wall: