sorry, no idea, but just a thought re the cutting which looks to be what the guys on the other side of the pond call 'cane' and we usually refer to as hobnail - might suggest this is a States piece.
Would agree that the cut-out below the top rim, suggests that a ladle or long spoon might have been part of this piece of kit, plus a lid of sorts.
Don't quite follow your description .............. are you saying there is actually a hole in the underside - and what is the extent, if any, of wear?