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I think it is fair to add that right at the end, in 1980, Strathearn made a few higher quality, more complex weight than in the preceding years. The three 'production' designs of that year are well documented (but, understandably, confuse a number of people who come across them, one design even being referred to as 'Baccarat' on more than one occasion). According to Dave Moir (one of the workers there at the end) there were quite a few nice one-off weights made in the last few weeks of their existence. I guess these are: a) uncommon; b)hard to identify; c) quite desirable..!
Alan