Anyone know what the 'clipper' chip looks like ?

From: Alex Bird (alex_at_redbeastie.fsnet.co.uk)
Date: 01/27/05 

Date: 27 Jan 2005 04:44:27 -0800

Hi,
I recently found an old secure dial-in box, of no use at all of course,
but the model is supposed to have a clipper chip in.

I would like to have one as a memento of government folly, maybe frame
it, but I can't find it. How is it marked ?

Cheers,
Alex