This is an amazing very large Fred Harvey Era Thunderbird brooch. 
Silver with stamped detailing and a turquoise stone in the center. 
The wingspan of the brooch is over 4". 
It is an amazing statement piece. 
Unsigned. 
15.3 Grams
MEASUREMENTS: 4 1/4" L x 1 1/2" H
CONDITION: Excellent, pre-owned vintage brooch.