Welcome to the site.
It is about 150 years old, and from Walter & Alfred Gilbey in Knockando, Scotland.
That reply above is for the Silver version, but from same maker.
The name Saumur is a French wine.
So the medallion is from a wine bottle.
There is this ...
Gilbey’s advertisement for Sparkling Saumur, Burnley Gazette, 1876