Early Winters appears to be an outfitter (tripping) company in Washington state. They don't appear to sell gear on-line.

http://www.earlywintersoutfitting.com/

I found this newsletter printed in 2003 that describes awarding someone an engraved brass sierra cup:

http://www.amc-ny.org/facilities-services/trailswaves/trailswaves200301spring.pdf

Both have telephone numbers associated with them. You might contact them to see if they know anything about brass sierra cups.

Ken K.