Clearly the same potter who executed the Hopi jar listed ahead of this one, made this fine example. Most likely they were made as a pair. Additional research aligns this pot with the work of Hattie Carl.
"Unknown artist" is appropriate when a work of art is unsigned and a supported opinion about who made it is not available (on Savvy Collector).. "Attributed to" precedes the name of an artist when information suggests that it likely was made by that artist (on Savvy Collector).