Yippie Ki Yay [Expletive Deleted]!

This one says H.A. Juster Co., distributor, which seems to be a clothing/textile company. Below that are ads for Mayo Spruce, which seems to have been a t-shirt company from the 1950s, and Blue Bell Wrangler, reflective of the early days of the Wrangler jeans company.

Assuming that this is the same company or a predecessor or ancestor of Juster Brothers, there are also many interesting photos available from Historical Society. Several of them are interiors from the 1920s of a textile factory, although the main store front seems to be at nearby but different location. I'm not sure where the interiors are. Also the old store front looks really familiar, but isn't at the listed location anymore. Juster Bros. apparently sponsored a Gopher football radio show in 1948. 1942 apparently was a good year for writing strange sales letters.

There are a bunch of shots of this one available of Flickr and elsewhere, including several that caught better light and weather than me. It's at the back of 319 1st Ave.