then I suggest you take it back and ask them if they are missing a goblet

What sort of help is it that you need Keith - it dates to c. 1870 - it's mould made as you know - one of thousands made no doubt - and sadly unlikely you will find the maker.

Always an outside chance it could be Sowerby - do you have the CD Rom catalogues? - don't think it's one of the Derbyshire patterns. Unfortunately, goblets were made in profusion - we need someone to recognize this particular pressed pattern. But they're a good area to collect and not expensive.
Keith - just had a look through my own pix of the goblets it did have, but couldn't see this one. The Kew archives show a few designs that were Registered - I don't hold out a lot of hope in seeing this particular pattern since presumably yours doesn't have a Rd. No. or lozenge - but will look for you in the next 48 hours. Goblets don't occur prolifically in the BoT records - suppose they didn't think them worth Registering.