Phillip Morton? Mountains or "M" on hammered silve

[Barbara Dodge]

In 1960 this item was purchased in Minneapolis. We thought it was by Phillip Morton who taught at th U of M. I was just looking at it again and the mark is not Morton (which is CM over "Sterling") but two mountain peaks? a stylized M?
See the item and the mark here:
http://www.flickr.com/photos/bldodge/3032642226/" onclick="window.open(this.href);return false;
http://www.flickr.com/photos/bldodge/3031802613/" onclick="window.open(this.href);return false;
.