Gary,
Here is the image of the copy in the Library of Congress.
It appears to have been created by adhering the CdV to a larger mount. The fact that the studio credit is on the left as opposed to the right I do not believe to be significant, but merely a manifestation of the studio mount being in the reverse direction whent the photo was adhered to it.
I might add that the Library of Congress describes the image as being an albumen photo.
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