The painting does not appear to be to the standards of Nampeyo of Hano herself, though I have seen plenty of examples of pottery from this period attributed to her. The item "Antique Large 12.5 Wide Native American Hopi Pottery Bowl Excellent" is in sale since Thursday, July 16, 2015. This item is in the category "Collectibles\Cultures & Ethnicities\Native American\ US\1800-1934\Pottery".
The seller is "stmoorea" and is located in Woodridge, Illinois. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, SG, NO, SA, UA, AE, QA, KW, BH, HR, MY, CL, CO, CR, DO, PA, TT, GT, SV, HN, JM.