I've turned about 2 dozen of these now and have given them all away as gifts. This one is made from yellowheart and is 2" in diameter with a 1 7/16" clock insert. The wood was a piece of scrap from another project and the clock insert came from Hobby Lobby and the chain came from Klockit. I've done a little tutorial on how I make them and it can be found at http://jimgsr.freehostia.com/watch/Pocket%20Watch.htm
If I am doing them wrong, please don't tell me, the way I'm doing them in the tutorial works for me and everyone that's gotten one from me has liked them. This one will go to a brother-in-law.