Only today (15-03-2008) I became aware of this very special and wonderful motorcycle. The Packer Special is supposed to be an American Board Racer from 1914. It should be a 1000 cc V-twin with three desmodromically operated valves per cylinder. Made in Philadelphia Pennsylvania.
NB: This very Packer is a recent creation "in a 1914 style" and so historical researches can not be based on it.
Pictures are taken in the Sammy Miller Museum GB.
Source pics = FLICKR (public domain)
Nb Although added to Desmodromology I still have to check (autopsy) the desmo-claim on the info.-plate.

See also:
More documentation wanted.
Video in the Sammy Miller Museum with Packer images:
[Classification = still unknown]