it looks to me like a gibson ripper, id get new pots and wire, and keep the pups, rotary, and black mystery thing, i also suggest shielding in the pup and control cavities, basses often hum more than guitars. i have low output jazz pups in my bass, and they hum when one is off, or at a lower volume, the only time there isn't hum is when they are at the same volume.
so yeah, shield it.
side note, hipshot makes a replacement gibson bridge, you might want to do get one and do an a/b test.
http://www.hipshotproducts.com/cart.php?m=product_detail&p=264
added mass and what not mkkk added cost to.
they sell at list price from the factory, go figure, i'll try finding a dealer who carries it, it would probably cost about $80 bucks from a store.