This is a framed, wearable sculpture brooch. It is 2 inches long and made of pewter, brass and has a nickel silver pinback. It has 4 moving parts – the two drive wheels, the drive wheel linkage and the front wheel. Its frame is 8 inches long.
For a detailed & illustrated description of how this piece was made, go to: http://steamsmithworks.blogspot.com and scroll to March 4, 2015.