This is a mark used by the Mount Washington Glass Company. It has the word Ambero written out. Under that is a C with a line through it.
![Vase Marked With Ambero Vase Marked With Ambero](http://www.mtwashingtonglass.com/wp-content/uploads/2012/09/mt-washington-glass-mark-01.jpg)
Thank you! -MtWashingtonGlass.com Team
This is a mark used by the Mount Washington Glass Company. It has the word Ambero written out. Under that is a C with a line through it.