While continuing to hope for an id of the pilot and unit of Nieuport 21 N.2664,in the previous photo in this thread here is a photo of another Nieuport currently on delcampe.
https://www.delcampe.net/en_GB/colle...944851300.html
Nieuport 27 N.558*
Any assistance with the identification of the unit of this machine would also be welcome.
Regards,
Clint