many thanks for the additional pix Steven. Taking photographs, from the Kew archives, that show a level of contrast/definition that makes them fit for purpose for this thread, is often difficult. Glossy 1930s b. & w. snaps all too easily pick up glare from overhead lighting, and some even show glare that was captured when the original picture was taken, so your pix much appreciated.
Looking at my recent pictures from Kew, above, of the two celeries, they show what appear to be clear glass bases, though I've no idea what description you might give to the dark glass of the bodies.
Have to say I agree that visually it's unclear that the hart salt was in fact a stag - had M. Franckhauser modelled these salt cellars they might have looked more recognizable.
After I'd said the p. 16 picture showed a straight sided celery, I regretted my comment fairly quickly - the piece in question is a tad small within the overall image - anyway a flanged celery it is then.
There was a time I collected celeries, and looking back at my own archive pix there seems to be a general mix of straight sided and flanged-rim designs - so no idea why the former design from Jobling should be so rare.