*SALE PENDING TO ROB*
This is a dovetail for a C-11 OTA made by Celestron. This is the same dovetail that Celestron sells on the CGE 1100 telescopes.
The dovetail is just slightly smaller (about 1/16") than a Losmandy DC11. That means it may or may not fit on a G-11 mount. My experience has been that it works on some of the newer G-11 mounts that can clamp in a little tighter (as shown in the image), but may not work on some of the older G-11 mounts that don't clamp as tightly.
Of course, it works just fine on the mounts Celestron makes for the CGE 1100.
Dovetail is in excellent condition. It has only a couple of marks from normal use, but otherwise it is in excellent condition.