Propeller section id

[Geertse]

Hello,
I've recently acquired a propeller section.
Specifications:
10 bolt holes.
11 laminations.
Bolt hole diameter 15mm
Axle diameter 95mm
Space between bolt holes is 70mm

Props boss diameter 310mm
Boss thickness 210mm
It must have been from a very large prop.
Seems to be german(light colored)
Markings are fainted.
The edge is metal sheeting
Seems like a pusher propeller.
Are there 10 bolt props used in ww1 and on which type of airplane?
Kind regards,

[Geertse]

Any ideas?????
Engine?
Airplane?
Thanks,

[Dave]

Ten bolt holes should narrow it down, but I have no idea what it narrows it down to.