Hello,
Currently on ebay is a photo of Royal Aircraft Factory F.E.2d A6480 'Colony of Mauritius No.5 of 20 Squadron RFC at:
https://www.ebay.co.uk/itm/Royal-Fly...MAAOSw9G1fZPTj
The same seller has a photo of a Royal Aircraft Factory S.E.5a B825* at:
https://www.ebay.co.uk/itm/Royal-Fly...EAAOSw-RJfZPPO
Were any USAAS operated machines in this serial range? as many of the surroundingg personel appear to be American.
Regards,
Clint