This piece by Nieri was registered on 17th October 1961. The original registered design was just the raw chalkware, but I suspect it was finished in a black lacquer/paint before sale.
Drummer boy by Nieri – Reg 902921
The site for everything to know about DURON, Paoli, Nieri and Bacci vintage african black chalkware / gypsum sculptures and figurines made in the 1950s and 1960s
1950s vintage chalkware statues 