From what I can see, it looks correct (for 50's style wiring) but a birds-eye view would be better to see where everything is going.

FWIW I would re-flow the solder for the cap on the back of the volume pot. It looks like it could be a cold joint.

On another note, what brand is you HB? The wire colour code for the coils and grond has me confused. This would have no effect on the volume control issue, but it caught my eye.