I’ve cleaned up the miter box with some oil and a brass brush. It’s in good shape to my judgement. I only disassembled the guides. The slides were only dirty, not rusty nor pitted. The springs are all working as well. I’m very happy.
I did discover two things after removing the box from the board it was on and coating it liberally with linseed oil. The previous owner scribed his name onto the board, ‘Hugo Vogt’ which is my pastor’s father. Also, when I put the box back on the board, using his screws, I noticed that he had indeed painted the legs at some point. One screw and the board have red paint on them, matching the legs.
So the only thing left is to sharpen the saw itself.
-- Ni faru ion el ligno!