I have one of these brass sierra cups; it was purchased from the Early Winters catalog in the late 1970's or early 1980's. It has a geometric design and the words "Northern Lights" embossed from the rear into the bottom of the cup. The wire handle appears to be stainless steel. The roll quality is very high. You can tell it is brass all the way through as my copy has a couple of deep scratches in it that continue to show brass, so it was not plated.

Isn't Early Winters in Washington or Oregon?

Good luck; I wish I could tell you more.