I am not sure from your photographs: Moonflower has sort of a central peak rising from the base - which I don't see on your images (might just be obscured by the stencilled facet). Caithness also had a selection of "corporate designs", some of them not too different from standard unlimited designs. Design #19 on the 1993 flyer (below - sorry for the poor scan) looks a bit like your weight - just amethyst instead of silver.
Finding out the number made will be difficult, if not impossible, as most of the paperwork was discarded when Caithness went into receivership and moved to smaller premises.
I would be pleased, however, to get your permission to use your images for Scotland's Glass.