Gareth,
As Frank says, Richard does show some faceted weights in his Album.
And yes, catalogue (brochure) details are rather limited but what was available in 2000 was reproduced in John Simmonds book,
Paperweights From Great Britain, 1930-2000, showing that several standard design weights were also produced in faceted versions. Sometimes the faceting was just a single cut to allow the weight to be stood on its side. Often there were five or six side cuts and a top facet. Some designs had all over "geometric" faceting.
Personally, I think that the best faceted Strathearn designs were the blue-over-white overlays which had to be faceted in order to view the internal structure - which was, I think, mostly a regular "cartwheel spoke" pattern.
If you would like to email images of your faceted weights to me, I will happily check them out for you.
On the point about nobody yet doing cane matching for Strathearn, that is true, but some work on this has been attempted. For my own part, I have started cane matching in order to understand the complications arising from Strathearn (and Vasart) canes being used in "later Scottish" work of as yet unknown attribution. I also suggested to Richard that he might like to follow my example of "Ysart cane tables" using his Strathearn weights. He said it would a great idea, but at the present time, an unachievable one.
