RARE Signed RKT Alabama Coushatta Native American Arts Crafts Pottery Vase

Nice pottery vase. Chocolate brown in color.
Measures 4" tall, 15" diameter at the fatest part (middle) of vase, 2 1/4" diameter hole at top of vase.
Clearly marked on the bottom "Alabama Coushatta Tribe". Then there is an area of glaze missing, so we paper traced this writing "RKT Mar/85".
Two very tiny glaze pops on the design, and glaze portion off the bottom (pictured).