These two are Louis and Florence Shotridge—the same “Shotridges” listed as the copyright holders. They were Tlingit, so the clothes aren’t accurate. Their Tlingit names were Situwuka and Katkwachsnea, which is how the image is titledat the Library of Congress.
Louis Shotridge was a museum curator and ethnologist—one of the first Native Americans to work in the scientific study of Native American cultures.
BMW R75/7 “night tracker” : CLUTCH CUSTOM MOTORCYCLES/