Just for a bit of extra info:
I cannot find this weight in the Charlton Catalogue of Caithness Paperweights (2nd edition, with items up to 2004). But we already know that some weights were not included in the catalogue for some (unknown) reasons.
The outer ring of canes are definitely Caithness canes, although the same cane can be seen in Edinburgh Crystal paperweights (which were made by Caithness) and also in John Deacon's weights, especially his former "St Kilda" line. This latter point is not surprising, since John told me that at one stage he was contracted to pull canes for Caithness.
(If this weight was an Edinburgh item, it would have had an "E" cane somewhere in the design.)
As Allan has said, Willie Manson worked as a designer / maker at Caithness. [Up until 1970, he was at Caithness but only as an apprentice and went with Paul Ysart at the start of Paul's own venture at Harland.] My understanding from the books is that Willie's later Caithness activity started in 1974 but his first designs ("Millefiori Reflections" & "Latticino") were 1976 weights. His last design in that period was in 1979. A second period at Caithness started in 1981 and ended in 1991.
From 1979 to 1980, William Manson Paperweights operated, and the lower-priced weights were marketed as the "Scotia" range. As far as I am aware, the canes in the outer row of the "burning castle" weight were never used by Willie Manson during his independent period.