Dave, I had the same thoughts yesterday.
It looks like a 3-bay pusher with equal span wings (no oblique struts visible through the wire-net fence

) that did not have additional kingposts and with a low nacelle and a low landing gear of what the rear wheels yet to recognise are placed far behind the leading edge, not like most of the other pushers.
I don't know something that fits.
The Ago/Otto pushers of 1912/1913 did not had this kind of tail,
the Bollekens Nelis-Farman GN.1 resembles a little this picture, only the covered gondola does not seem to match here and the Avro 508 had an additional vertical stabilizer infront of the rudder.
To me it leaves a Farman not built by Farman. Maybe a russian Farman-Voisin mixup - something like Olkhovskij.
Or it's a Voisin accidently fitted with a Farman tail.
edit: is the
Farman HF 27 already out of the race?
see 1915 type:
Cheers
Aquilius