No way are they stackable unless they are piled up for junk removal, the poor things.
The little washer has a blue porcelain tub with an aluminum agitator. There is a simple gravity drain hose and there is a hand-operated wringer that can be attached to the washer. This trio looks like it has been buried since the early 60s. Can you imagine the conditions from which they were removed? The belts are probably rusted to the pulleys if there are pulleys that have not succumbed to the rust.