There are few sets of stereoviews that are numbered on the back.
The London Stereoscopic.
N&Z daguerreotypes.
Glass views.
N&Z cream mounts. These were also issued in yellow mounts, and then in yellow with pasted labels. I have also realised in the last few months that images from the two Delamotte/Crystal Palace set of stereoviews were also recycled.
While the description on the back is always accurate, the image can be an alternative view. I have just casually scanned this list [composed by whom?] and while it seems to be mainly of the Cream mounts there are some discrepancies.
OK thanks for your time! So the list wouldn't cover all the yellow ones we see time and time again on Ebay? So there must have been a lot more than 204 stereoviews of the CP published by N&Z...