The vase on the far left is a fairly close match to the colouration of the ruby over citron piece my parents own. I will post an image later today.
I know that I can't assume that the chocolate variant is actually ruby over citron, but the description is such a close match it seems too much of a coincidence.
I'm not sure why you think the ruby over citron pieces can't be Stuart's. The shape and tooling on the eyes certainly seem to match other Stuart's pieces I have seen.
As I have mentioned earlier, Webb's designs don't appear to have any tooling to the eyes of the peacock trails, which
might rule them out. Richardson's pieces appear to feature eye tooling that makes the central eye of the feather protrude out significantly, which may also rule them out as the maker. As for Harrach, I haven't seen enough examples to make a judgement, but my gut feeling tells me that these examples (ruby over citron) aren’t continental.
No one can know for certain without finding the exact patterns in the maker's records.
I have finally managed to put together some images.
The first set of images show what could be an example of the Stuart's 'chocolate' variant, which has been mentioned in previous threads:
http://www.glassfairs.co.uk/peacock.htmThe next set of images show two very different examples:
http://www.glassfairs.co.uk/peacock2.htmThe vase on the left has not been attributed, but the 'peacock eye trails' are distinctive in that they do not feature any tool-work in the centre of the eye. The trails on this piece are very similar to those illustrated in the Webb's pattern books (sorry no images yet).
The bowl on the right is by Richardson's (similar to a piece featured in Mervyn Gulliver's book - see previous posts for details). Note how the 'eyes' have a centre that is a different colour to the trail. The centre of the eyes also protrude quite significantly. Perhaps this is a signature feature unique to Richardson's?
The third page of images shows two examples that appear to be very similar to one another:
http://www.glassfairs.co.uk/peacock3.htmWhat you can't see very clearly, is that both pieces feature eyes that have differently coloured centres. Another feature that doesn't show up clearly is the tool-work on the tall vase. Although the vase on the right looks very similar, it's eyes are mostly smooth (i.e. no tool-work).
The final page of images features another two examples of peacock eye glass:
http://www.glassfairs.co.uk/peacock4.htmOn the left of the page is an epergne, with two close-up images. This piece seems to show a development of the trail design, fanning the head of the trail to meet the edge of the glass.
The image on the right is just another example that I thought I would share with you.
Hopefully the images provided will show just how varied the designs and techniques can be for this type of glass. If someone can link these signature features to designs in pattern books, it should make it easier to distinguish the work of one manufacturer from another.