It certainly does, Annie! Nice find.
He looks Sioux to me. I did a quick search for Arthur Iron Nest and found this excellent page of photographs of other Indians and their pipes, most of which are the same type. Grey Cloud's is made from 2 pieces. (You can see him attaching them together in the top pic I posted.) The closest examples to his on this page belong to John Comes Again (Sioux), Charles American Horse, William Frog and Shot in the Eye.
No tribe info on the last 3. Have a look!
http://www.hempmuseum.org/ROOMS/PEACEPIPES.htm
I also found this excerpt (and put my some of my suspicions in
bold). Granted it's from 1907 and the list is obviously not complete:
http://faculty.marianopolis.edu/c.belanger/quebechistory/encyclopedia/calumetpipe.htm
"The use of the calumet, sometimes called "peace-pipe" and "war pipe," was widespread in the Mississippi valley generally. It has been found among the Potawatomi,
Cheyenne,
Shoshoni, Pawnee Loups, Piegan, Santee , Yanktonais, Sihasapa, Kansa, Siksika,
Crows, Cree, Skitswish,
Nez Percés , Illinois , Chickasaw, Choctaw, Chitimacha, Chippewa, Winnebago, and Natchez . In the Ohio and St. Lawrence valleys and southward its use is not so definitely shown."
So far, the look of the pipe is leaning toward Sioux. Whatever the case may be, I'm 99.9% sure that in 1950, Grey Cloud lived in Canada. Evidence to follow...