This is a photo of the 1909 World's Fair held in Seattle, the Alaska Yukon Pacific Exposition. It is a reprint of a photo taken by Frank Nowell, the official photographer. Apparently Otto printed it on contract for the American Post Card Co.
Note how "Post" is spelled.
There is another Image 32 (32 - Loging on Puget Sound). Reuse of image numbers and different image series make it difficult to know how many images Otto published.