It is a combination of white enamel (wings), glittery white enamel (robe) and gold tone trim (head, hands, trumpet and Noel banner). This is a highly detailed, even gorgeous, angel pin. This is not a flat pin; the pin is thick, rounded, and raised. The pin measures about 2.75 inches long and about 1 inches in height.
The pin/brooch does have a maker's mark on the back . . . ©AJC (some sources call this OAJC since the copyright symbol © looks like an "O" on many jewelry pieces). This is the mark of the American Jewelry Manufacturing Company of Pittsburgh also referred to as the American Jewelry Chain company. The company used this mark beginning in 1927 up to 1997.