Caithness had a fair number of "Blanks" for that purpose, many with an oblique front facet for whatever design was wanted: I had made one (a "one off"
) for myself - obviously larger orders were also welcome. As a result the number of such weights will be close to endless. Some seem to have been designed especially for the commissioning company (I mean the weight itself) - the one for Harper Collins
- with the base engraved, rather than a front facet - being a very nice example ... IMHO "collectable" even if you have no interest in Harper Collins whatsoever.
These editions do not show up in the Charlton book, nor in any sales brochures - for an obvious reason, they could not be bought from Caithness. Nevertheless we are trying to include a few nice examples in the online catalogue on Scotlandsglass. In other words - if you could let me have high resolution images of your Thermomax and Barclays weights (preferentially against uniform white background, and views from several angles), these would be most welcome.