Rotol blade – Maybe you can help

Hello

A friend of mine asked about a british propeller blade. From the markings, (RA 4071/J, J5) the firsts steps of
the deduction process are easy : Rotol and Jablo construction wood blade. But what could be the plane on which a propeller
using this blade was mounted ?

The blade is 162 cm long, (5 feet 4 inches), and how the blade landed here in France is unknown. Probably from a
downed or accidented plane.

In advance, many thanks for any information you could provide.