Hi Paul,
the vase is definately by Caithness, as I have a couple of these with the etched mark on the base.
Unfortunately, I've not been able to put a name to the design as yet, but have seen them in 3 different colourways to date, which are; pink, blue and turquoise.
I'd be guessing for now, that these date to the late 80's or early 90's, as the vase shapes that I've seen, look to be the same as those used for the 'Adagio' range, which appears in the 1989 catalogue, but sadly, that's about all I know.
Best wishes,
Pete