Not often that a nautical theme comes up! I suspect that the piece is not chalk ware, but it is included in this collection as Menesini had tried other pieces with chalk.
Table lamp by Menesini – Reg 895568
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 