From my research the mark in back with USA and the backwards S is said to be by Brush/McCoy, McCoy book calls this particular wall pocket is called Star burst mottled green glaze number 73.
George Brush went to work for J.W. McCoy Pottery company in 1911 they merged and became the Brush/McCoy.
The wall pocket is in excellent condition no chips or cracks. Measures 7" tall x 7" wide x 4 1/2" deep Wall pocket reminds me of a Elephant tusk.
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