This is a Star Adventurer Latitude (EQ) Base that is in excellent condition.  It shows almost no signs of use with the exception of a little mark on the dovetail clamp.  See the photos.   

The Star Adventurer Latitude (EQ) Base provides a smooth and reliable way to polar align your mount. With internal gearing the Latitude Base makes aligning to the north celestial pole easy and repeatable.

The Latitude Base features a V-style dovetail system and mounting block. The mounting block threads on the Star Adventurer and allows you to quickly mount or dismount your Star Adventurer to the Latitude Base. The Base also features latitude degree markers to easily adjust the Star Adventurer to the correct placement. Underneath the Base is a 3/8 thread which can mount to many of today's popular photo tripods.