Hi Detlef
The phallus part does look like ivory, with those dark patina areas - reminds me of Lega or Luba ivories. I've had hippo tusks and they get that type of ridged surface and pale patina near the roots.
The Royal Museum for Central Africa, Tervuren, Belgium must be the ultimate authority on Congo stuff - if you want to try them. My guess is its an amulet or divination type object. Interesting piece - if you get tired of it and want to pass it on - let me know !
Regards
Colin
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