John,
The plane being modeled is a generic JN4-D2, production model, based on the Joe Nieto drawings that appeared in Model Airplane News.
S/N 2508, the plane which is depicted in Nieto's drawings is now in the Air Force museum at Wright-Patterson AFB. 2508 has been repainted by someone, somewhere along the line in solid olive drab, so no longer has the Air Service Mechanic's School markings as shown in the drawings. Incidentally, I clipped those drawings from MAN when I was a kid and have been carrying them around, along with many others, for a long time.
I haven't been able to find much evidence that most JN4-D2s were painted anything except clear dope and varnish, except for the Navy versions which were apparently grey or silver and yellow. Since color film wasn't available, descriptions have to do as far as colors go. Also the film used in those days did not render colors in a consistent grey scale, so estimates from B/W photos are often erroneous. Some late production Jennies were reportedly painted solid OD or Yellow, there were other variations as well. There is also some confusion about color since the varnish used would turn yellow/brown pretty rapidly.
My model carries serial number 2722 which was very close to the 2508, so I'm making the somewhat cavalier assumption it would have been at Kelly Field at about the same time. I found a list of all the early Army Air Corps serial numbers on line. I didn't want to use 2508 because it has been done many times. My model combines details from research, the Nieto drawings, archival Jenny photos and many photos of the Daughtry Jenny at Golden Age museum, the Jenny at Flying Heritage museum and the Jenny at the Hood River Oregon museum, as well as some photos of Jennies under construction in the Curtiss factory. Also had some correspondence and phone conversations with the Flying Heritage curator, and the gentleman that did the actual restoration work on that airplane, and not least, Brian Karli's website showing his construction of a full scale Jenny from Curtiss blueprints.
Hope this sort of answers your question.
John W