Wooden instrument box from the USA from 1935

A pretty instrument box from the usa, in mahogany with a leather handle. The patina is original and varnished, on the body we can see a round red stamp with the indication r33. The box has its key. A card under plastic informs us that the measuring device that was inside was a “weston dc milliammeter model 1”, april 10, 1935. Its dimensions are 19 cm in length, 12 cm in width and 19 cm in height.