Jan;
I checked the serial #'s list at
att.net/~jbaugher/usafserials.html" target="_blank">http://home.att.net/~jbaugher/usafserials.html
the Junkers J-1 is not listed, most of the rest of the aircraft are. The only reference to Junkers is 64122/64123 Junkers Larsen JL-6
64122 had McCook Field Project Number P145. Salvaged Nov 5, 1923