Who made these 23mm Zulus?

I have some figures in my collection that I have no idea who made them. While I'm deciding to sell them I'd like to know a bit more about them. Obviously these 23mm foot to eye chaps don't know they could be off on a journey, but they can't help to have noticed they don't fit in with the 28mm lovelies in the plastic pile.

So blog land any clue who made these?

This is the first Impi out of the box, there are another 2 thumping their shields inside.