Well antiquers, the mystery of the UPW kitchen implement deepens. It arrived today and it is not a potato masher. All the potato mashers are showing a round bottom. This one is flat and even slightly concave, except for the center where there is a very slight point. This makes it sit almost flat and accounts for the wear and staining in a tiny spot in the center and along the edges, because it teeters a little on this point.
The handle is not glued in. It is loose and lifts up about 1/8" but does not actually come out of the porcelain base. (Not sure how that is accomplished) There is a lot of wear at the point where the handle contacts the porcelain. It looks like the handle has been rubbing against this surface for a VERY long time and it has more wear here than anyplace else. This makes me think the handle has either been designed to move a little, or it has been loose like this during many, many years of use.
The handle is hand carved, not turned on a lathe. It is quite irregular, although it looks like someone really tried hard to make it uniform (Very cool IMHO!!) It is sanded smooth, but looking at it with a little magnification, I can see some very faint tool marks in the form of tiny lines. They are all going the same direction on the biggest part of the handle, and they change direction where the handle starts tapering down to the neck. They go in the opposite diretion here, and it looks like the carver worked the wood from the opposite direction on this part. (I'm learning a lot from this little guy already!) I think this would be consistant with the days prior to the lathe being commonly used. (Post 1880).
The porcelain piece has a nice clear glaze on the white so that it is not porous, much like a bathroom sink would have. The U.P.W. logo is beneath the glaze and has been protected. It is dark green, consistant with the example on page 1 of this thread that dates it to about 1877. The porcelain part was definitely formed in a mold and is very uniform in shape, so I do think that these were mass-produced. Now if we could just find another one!
I'll do my best to get some photos of all of this. My camera is toast and I'm down to just cell phone photography, but I'll give it a shot.
...Guess I posted that "Case Solved" graphic a weeeeeee bit prematurely, eh?!!