This is a Vintage Mid Century Modern Atlas Silver Rim and Crest Tumbler/Highball Glass.  It features a silver helmet with a crest which covers the entire glass.  The silver rim is approximately 1 1/8" thick around the top of the glass.  It stands approximately 5 1/2" tall and is 2 3/4" in diameter on the top of the glass.  The bottom of the glass narrows to approximately 2"  in diameter.  It is in very good vintage condition with no chips or cracks.