These are three strange replicas that were made a long time ago by some, probably American, plate manufacturer. Why they were made I have no idea but they are pretty good copies of second world war British Army in the Sudan and Egypt plates. There is one genuine one in a collection (ex Karel Stoel) but the rest are these replicas. The real plate is pressed or painted steel and I guess these replicas are aluminium. I would think there may be more of these replicas in older collections.