This is Celestial Innovations "High-Lite" binocular support. These were sold back in the late '80s. This is a model 80, designed to accomodate binoculars with up to 80mm objectives weighing about 4lbs. It includes all the original options and 5 page instruction manual. Price is $35.00. Buyer pays actual USPS shipping.
I have other photos I can send if you are interested. If you have your old Sky&Telescope issues right at hand, there is an ad with illustration on p. 537 of the May 1987 issue (and probably other issues as well).