Here is a rare find. This cuff was made by Michael Durkee (1948-1999). Michael was anglo and spent a year studying silversmithing with Hopi master smiths. 

This cuff was tufa stone cast and has awesome marking inside. The texture is rough making it harder to read his hallmark, but it is there. Solder iw wide and primitive and I am sure this was constructed with the old methods. 

It is set with mint green turquoise that is natural. Red stones are coral.

Interior measures 5 1/8" plus the opening of 1". It will fit a 6 1/8" wrist. Very thick and rigid. Likely won't bend to fit. 18mm wide. Weight: 50.7 grams.