Wood Wing and Radial Engine ?

These two stainless firewalls are waiting to be cleaned and straightened – but I am not sure what they are from.

Both had castings attached that had remains of wood on the wing/fuselage side.

The only marking so far is the elegant stamped 252086 BR786 and BW inspectors stamp – shown below.

They are ca. 1.2 m dia and 60 cm high.

I assume a radial engine and a wooden wing aircraft which sounds like a pre war combination.. I assume that they are a matched pair from either wing – or the top and bottom of the same firewall – but could be VERY wrong – again…

No hints on any of the Manufacturers stamp listings.

Any suggestions?