The link to a Stevens and Williams scent bottle is useful, since I didn't know about it, but you're not analysing what you're looking at - the two things bare no relationship with each other. Thickness of glass, the way the enamel's laid in, the crackle effect, the age, etc., etc.
The vase from this thread doesn't relate to anything I am aware of by S&W / Royal Brierley.
The shape is recorded as by Nazeing. Although the colour combination is unusual, I can see the pull-ups coming through the two colours, which is a Nazeing trait, as is the way the pontil is finished. I would therefore go with pre-war Nazeing.
Nigel
PS. Steven, Any chance you could send me high res images and accurate measurements, so that I can add it to the records I hold? Thanks, Nigel