Thanks to Pam McGowen for sending me an image of a kneeling man that looks remarkably like the Kneeling Lady. Clearly the same designer, but still unknown.
Kneeling man by Unknown
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 