The knife-switch/fuse holder combo is similar to the one I posted somewhere else here some time back.
This one's more elegant-looking, with a little porcelain knob on a bracket instead of just a phenolic ring bridging the two blades. They usually take 30-amp fuses.
Considering the box is made out of wood, the asbestos sheets are a smart idea. Just don't go poking them with a stick and you should be fine. I've heard that to "make it safe" you can spray that stuff with lacquer or something to bind the fibers.
Are u gonna stick some fuse plugs into it? It looks kinda nekkid without them.
Where'd u find this bad boy?