I'm not an expert on early Caithness paperweights, but I do have one which puzzled me for several years before I worked out that one of the pairs of initials scratched on the base was CT - Colin Terris!
I know now there is a code identifying the year of production of later weights, but I understand that this does not apply to the very earliest production.
What I'm trying to say is that both look rather "Caithness" to me, and if 70s, certainly not junk. (Well, I like them!!!