While that call sign sounds logical with the fuselage numbers, I have to wonder if the paint job is new if you go with that number. I found a photo of N4699D at airliners.net from 2004:
http://www.airliners.net/photo/Antique-Flying-Machines/Boeing-N2S-1-Kaydet/0753537/&sid=748619814841e916e59b907e92030c07
My aviation.net also has a photo from 2004:
http://www.myaviation.net/search/photo_search.php?id=00243837
Those are the only photos I can find of that registration.
