It's ugly enough to be a Jose mod - messy wiring, uneven jacks, holes drilled over text, etc - and looks to be a similar era, but I never saw a Jose mod that had masked components.
The loop circuit looks like a Rivera era Fender circuit. A sharp close up of the loop wiring area would help. Also a sharp closeup of the pull-pot on the front panel. The small imported loop pots also make me think not Jose.
A trademark of Jose mods was chassis ground connections done with big ugly solder blobs. I don't see any of that here. That's actually a good thing.
BB