Need help identifying a mount

Folks,

Can someone help me identify the mount model shown in the attached photograph (which popped up and then disappeared in the classifieds recently)?

Thank you!

Attached Image:

Unitron 150 which was used with their 4" F15 refractor.
There are some pictures of one at
http://www.astromart.com/classifieds/details.asp?classified_id=395188
No longer in production, but sometimes seen on the used market.