On Thu, 11 May 2006 21:31:45 +0000, DoN. Nichols wrote:

662) Maybe I *should* recognize it -- but I don't.

The size (based on the grain of the tabletop behind it) looks to
be on the order of 1 to 1-1/2" diameter.

The castellated design suggests to me that it *might* be part of
a child-proof bottle cap for medicine bottles, but I don't see
any threads, so if so, it is from a strange view.

I remember as a kid, trying to fit two of these together, interleaving
the castellations. ;-) I figured the white one and black one should just
mesh, but no luck. ;-)

Cheers!
Rich