Antique Furniture Direct has dated this piece to the 1920s.
A stylish arts and crafts brass convex mirror or butlers mirror. The circular frame in pressed brass with raised stylised leaves and acorns.

Construction/Wood:
Pressed brass
Condition Report:
The mirror glass is foxed and slightly smoky (see photos). General marks and scuffs commensurate with age.
Dimensions:
Frame Diameter: 14 inches
Mirror Glass Diameter: 9.5 inches
Antique Furniture Direct has dated this piece to the 1920s.
You can view the stock and full dealer information on the Antique Furniture Direct Profile Page