Hello,
Currently on ebay are several photos of Curtiss aircraft including JN-4D 3016.What is possibly more interesting is a photo of an aircraft numbered 731.According to Joe Baughers site
http://joebaugher.com/usaf_serials/1908-1920.html serial number 731 falls within a cancelled batch,assuming that is we're looking at a serial number,as it is quite possible that the actual blurred serial number sc***** is seen above the larger digits. The photos are here
https://www.ebay.com/itm/28609821587...Bk9SR8625qnOZA
Regards,
Clint