From card: "Made in catlinite and representing a buffalo foot. Made by the brother of Francis La Flesche. It is a copy of the pipe in the sacred bundle of the Omaha."
Disk/disc pipe.
For similar pipes, see Plate 144, Figure 5, Plate 151, and Plate 152, Figures 1 and 2, in West, G. Arbor. (1934). Tobacco, pipes and smoking customs of the American Indians. Milwaukee, Wis.: Pub. by order of the Board of trustees, Pt. 2. Identified there as ceremonial or war bundle type disk pipes and noted as very rare type.