Vintage owl belt buckle in the brutalist modernist style.
Heavily detailed, very amazing piece.
I don't think the piece is solid brass, it is likely plated or has a color wash.
The color is a warm tone silver-gold. 

MATERIAL: Metal with plated finish.

Overall length - 3 3/8", x 2 1/2" H. The face is 2 1/2" x2 5/8"
Belt loop opening: 1 7/8"