Hello,
Currently on ebay is a nice photo with a large number of USN Floatplanes at:
https://www.ebay.com/itm/Vintage-191...kAAOSwYmVgKvLo
The aircraft are predominantly Curtiss N-9 or N-9H (some Burgess built) but there is also at least one Curtiss R-6,serial 340.
Regards,
Clint