Thanks Paul, the blue is a lovely shade. Davidson's Royal Blue was quite a departure from the majority of colours they produced around that time.
Thanks Adrian for checking your catalogues, much appreciated. I'll have another look through a few other catalogues for other makers just in case.
This particular blue is fairly distinctive. When I get a moment I'll try and a take a few extra photos. The quality of the pressing is fairly good, there are the occasional straw marks on very close inspection. - the colour looks ok for Moser, although in comparison to other Moser pieces I have owned, this piece doesn't quite have the sharpness to it on close inspection.
Thanks Ekimp, interesting to get your thoughts on the catalogue image. I did wonder if the catalogue example had 10 sides, the facets are indeed a little easier to count around the base section. Catalogue images are hard to compare at the best of times!
It's a shame I can't seem to find another example of pattern 284, although if it is the case that they were only produced in Royal Blue, I suspect not many come to light. I did drop Chis and Val an email a few days back to get their views, if I hear anything I will update this thread.
Thanks all.