This image is unsigned but has Otto's distinctive writing. He took many photos of the Golden Potlatch parades held from 1911 to 1913; not all of them were signed.
This photo was also printed as Image 35:
The second image is courtesy of Dan Kerlee.
There is another Image 35 (X35 - Agriculture Bldg. & Arctic Circle A.Y.P.E.) showing an exhibit hall from the 1909 World's Fair held in Seattle, the Alaska Yukon Pacific Exposition. Reuse of image numbers and different image series make it difficult to know how many images Otto published.