you make it sound as though you're knee deep in these things

We can't argue with lozenge Registrations - especially those that can be decyphered - however there is some confusion here, and the caption description in the link is wrong, insofar as Sowerby's Aesthetic-green is a non-opalescent opaque colourway and looks nothing like this. I'm also a little confused regarding use of the word vaseline, in the link - am I reading Christine's comments correctly and that these Sowerby pieces don't contain uranium? This Sowerby opalescent piece in the link refers to Board of Trade Registration 340005, and is described on the original factory drawing as a 'square vase' and shows nothing of the pressed decoration as appears in the flesh - judging by the price and lack of other images of such things, it appears to be rare.
Copy of the original factory drawing now attached. In Cottle's reproduction of Pattern Book IX (1882 - 12 pages) he shows this design as pattern 1437, and his illustrated example includes the decoration showing in the link. Cottle doesn't confirm this pattern in his own text, for some reason there's just a blank against 340005
P.S. is it me, or are we looking at two different colours - is there an actual difference between the colour of Mike's creamer and the peppermint of the linked item?