At the bottom of the page you can see some recent sales at auction. Also note that few collector on numista seem to have it (Rarity Index 93) and nobody has it for swap.
Just call me Bram
No new swaps for the moment, still too many half-ongoing swaps to clean up!
Most colonial African currency is tough, from scarce to rare (& typically in poor shape). Most of the early West African, Belgian-Congo & Rwanda-Burundi (French) lasted 2 years. German African notes are almost impossible to find.