I though I would post a couple of items on distinctive markings; this is a Romanian Nieuport in early 1917 ( one of 28 Type 11s) with Bert Hall and mechanic ( ex-Lafayette) on a mission to Romania.
The cocardes are the same colour as later ones but in a different order, yellow centre, then blue, then red outer. Rudder stripes are ( from front) yellow, blue, red, the serial is in white on the blue.
The other photo ( from the 1919 edition of JANES) shows the cocardes in use on both fuselage and wings.
Nick
https://en.wikipedia.org/wiki/Bert_H...ort_11_C.1.jpg