15 Jan 2013, 21:31
Thanks for the help!
The F231-5000 crystal is a simple little rectangle with slightly rounded corners - no fancy graphics, logos, or stencils needed, so it would be pretty easy to fabricate a new one if I can't find one.
It looks like it was just glued into the frame, so I must have loosened it on the last battery change and it popped out some time when my wife was wearing it.
-abe.
p.s. I just got a gold colored F231-4000 with the metallic purple face. Love it.