The Annabelle series
The Annabelle series was a model of android, simulating the appearance of the Human female. Androids in the series were designed to Harry Mudd's "exacting" specifications, and were constructed on the planet Mudd in 2268. This series was a particular favorite of Mudd's. (TOS: "I, Mudd")
The Annabelle series was played by an unknown actress (see the discussion page for more information).
She is wearing a costume originally worn by Marlys Burdette in "Wolf in the Fold".
In a close-up shot cut from the finished episode, her neck identification number can be read as "007" which is possibly an in-joke reference to the James Bond franchise.