About the propeller, The propeller was produced by the French   manufacturer – most likely Ratier. Pictures were taken in 2013, presented here thanks to Andrzej Jasiński.

Construction, The propeller lamination consists of 9 ash (most likely) plies. The outboard length of leading edge of approx. 800 mm and the tips have brass sheathing. Originally coated with Black painting – most likely Tonkilaque – therefore black letters marking.

Aircraft and Engine, Markings indicate Schreck FBA flying boat as the aircraft  powered by this propeller. The propeller was working Hispano Suiza 18o HP engine.

References:

1. A. Morgała “Samoloty wojskowe w Polsce 1924 – 1939” Warszawa 2003