Tradewinds Inc. of Tacoma Wa. who was the importer of the Husqvarna line of rifles, Barreled actions, actions, scopes etc. sold these in the 60's.
That peep sight was called the Tradewinds Snap-Shooter and was designed to fit the factory drilled HVA actions."Micrometer click elevation adjustments, sliding windage adjustment with inset locking screws, no protruding knobs to distract the eye from the aperture".
Francis Sell, the outdoors author, who was from the Washington-Oregon area wrote about and recommended these little gems.
Bob