Great stuff Sajen & indeed Jampot... well spotted!
Its obviously the same chap who brought this one back.
So I think the Yao/ Malawi finding of these is above reproach myself.
Just who made/sold them, is the last bit of the puzzle.
I still think the African trading Company could be plausible! But so could other Indian or British entrepreneurs, The to me seem a bit late in dating for them to be from Arab slave trade, but in truth I guess that carried on a for a long time, just as slavery still does today...
spiral