I saw this on ebay and thought it was pretty interesting. No, it's not my auction (I wouldn't sell it if I had it).

It's a Howard clock with Fay escapement.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=13854&item=6507286879&rd=1

Andy,
Thanks for posting that! That is one I have never seen! What an interesting movement.

To All:
When you read Andy's post, don't just look at the one picture, you have to hit the link and see all the pictures. Very unusual and interesting clock.