on-edge, neat find. I think 1859 is right that it is the same as the California Stae park's example, but I also think the California State park may be wrong about what it is.
I've dug up two of these in fields in the U.S., and witnessed a thrird dug in a British field. When I found mine, I was told by an old farmer that his father had used once like it. It was a corn husker which was worn on the thumb and palm. It once had leather attched to it which incircled the hand, with the thumb going through the hole.
If you'll notice the california example, on the arm which they in my opinion "guessed" was attached to the candle base, it is attached with both a riviet and washer. Although the thumb rest and the placement of the two arms resembles some candle sticks, this "handle" would not be attached this way. It would either be cast as one unit, or if two pieces, would be attached with a rivet only. The only exception might be if the candle base was made of poorer metal such as sheet brass or tin, but this makes no sense, as the handle would then be formed by a tinsmith of the same materials.
You'll notice the cutting blade (used to cut through the husks) is tapered and sharped. this is not the product of corrosion, but is deliberate (as it is on all examples I've seen). Your's is also tapered, and clearly did not "break" away from a candle base. In addition, there seem to be file marks on your examplke which show it to be intentionally formed.
My exampes, as well as the English example (listed now in Norwich museum as "husker") show the arm that attaches to the palm being removed. There is a stub there, but it is cleanly worn and filed flat (not broken off) Probably it was as easy to use the device without the palm.
<img src="http://i274.photobucket.com/albums/jj255/johnirwin_2008/husker.jpg" border="0" alt="husker">