I am a friend of Cast Iron Architecture

Object Number: 
Z.3599.3
Dimensions: 
3.7x2cm (1 7/16 x 3/4 in)
Description: 
Robin's Egg blue pin with black lettering reading "I am a friend of CAST IRON ARCHITECTURE"
Credit Line: 
unknown lender
Due to ongoing research, information about this object is subject to change.
Creative: Tronvig Group