The shape of the cutout almost reminds me of a bottle opener. What are the dimensions we’re dealing with?
I don’t think it would necessarily be a good bottle opener. But the mismatched sizes of the “feet” could mean it was hand made, possibly by an amateur? School shop project?
Did some digging and I believe this is it:
Box Mangle
I’ve never heard of it before, but it appear to be a giant laundry press. Not exactly my first guess!