Propeller of the RWD-5 SP-AJU aircraft.
The famous for South Atlantic flight, Stanisław Skarżyński’s plane was not equipped, like most of RWD-5s with Szomański propeller. On available photographs it was clear that propeller was not covered with Tonkilaque coating. It indicated different manufacturer. The picture above shows manufacturer logo: The Airscrew Co. Ltd Weybridge Surrey from United Kingdom.
Picture via Roman Postek, many thanks!