I assume that you have one of his bows that is referred to as a duoflex bow, which he - with assistance from Dr. Hickman - designed, but which Russ made.
There is an excellent article on Russell Guile Willcox and his famous duoflex bows that appeared in the most recent issue of the "Journal of the Society of Archer-Antiquaries", Vol. 53, 2010 entitled "A Duoflex Miscellany in Words and Pictures" by the late Roy King, a world reknown traditional bowyer.
Russ's bows were especially favored in Europe. There is one Englishman who was buried with one of Russ's bows - he liked it so much.
If you have Dr. Robert P. Elmer's book - "Target Archery", there is an excellent write-up on the bow along with pictures of Russ. Russ was from So. Egremont, Massachusetts located in the corner of MA, CT and NY. Dr. Elmer, one of America's pre-eminent archery historians, thought very highly of Russ's bows.
I just wrote a short article for the "ARROWHEAD" [a newsletter of the Society of Archer-Antiquaries] on Russ that will be published shortly] detailing my encounters with Russ. He was also a master woodworker and made minature furniture for collectors.
His bows were designed in a way that maximized the "working" area/length of the limbs. They were fast bows as well as light in hand.
It sounds like you are the fortunate owner of a very special bow.