

They weigh over 600 grams/piece and measure 19x15 centimeters.
I know some of these originate from Katanga/Congo. Is it possible to date these?
I got them as a gift from a friend, who knows I don't collect it, so I will be selling/swapping it eventually, but wish to know everything about them first. They look the same, except for the colour. One is in yellowish copper, where the other one is more red. Is that due to the copper, or the toning?
What value do these have?
Thanks in advance
Jos
