(click on pictures to enlarge)
I'd love to know more about these. All that I have found are repeater-style pencils (the one example shown is missing its top button), made to look more than a little like Eversharp Doric repeater pencils. Many have clips that are marked Sterling. Quality is generally not too bad, although I don't understand why you'd put a sterling silver clip on a pencil with a black plastic tip and top button.
The clip on the example on the right strongly resembles a Penman, but the clip may have been licensed or outsourced.
Note the similarity between these examples and the Whitlock.