Could you provide some more photos? I am stumped on this one, but it is likely a Krupp made commercial 10.5cm field howitzer, possible the M-1912/16 exported to Romania and also used by the Bulgarians. What it is not is the German 10.5cm leFH 98/09.
The rear extension behind the breech is very typical of Schnieder Howitzers & many of these were exported to Balkan states & others. I haven't ever seen a Krupp field piece with such an extension to support the gun tube at max recoil. The converse issue is the "square" recuperator housing in the front view & the wheel brakes mounted forward of the gun shield which are very atypical of Schnieder?
I'm not prepared to identify this weapon either; though I suspect it to be a Krupp shelf item. Forward brake pads are in common with the lFH98/09. Note the recessed horizontal sliding breach; not a common French practice ! Additionally I call your attention to the 12 spoke wheels. The French used 14 spoke wheels & this design feature was emulated by the Russians.