Hi - had a look through Mark Hill's book on Caithness glass, but regret can't seen any specific mention of William Wordsworth - the book lacks an index, unfortunately.
Some very talented engravers have worked for Caithness Glass over the past few decades - including Denis Mann who joined the company around 1970, and who was apparently responsible for engraving the BBC Mastermind trophy.
He seems to have parted from CG about 1998 to do freelance work, and subsequently produced trophies for Junior Mastermind and Celebrity Mastermind................. all of which was simply to suggest that it's possible that the MM on your piece just might indicate this to have been one of the Mastermind trophies. What the other letters/Nos. indicate I've no idea at the moment.
This is pure speculation on my part and the letters MM may well simply be for Wordsworth, but an academic character like WW would possibly be the sort of engraved subject that might be associated with Mastermind trophies.
Etching is a wet process, using acid to cut into the glass where a pre-designed outline has been cut or stencilled through a resist - there are no hand tools used in the process.
Engraving is a manual process aided by a machine driven copper wheel and some coarse/find grit which cuts into the glass - the dull/matt finish is part of the desired effect, and is not normally polished as in proper cut glass.
CG did also produce sandblasted images on their glass, and according to Mark Hill's book the majority of their glass carrying images was in fact sandblasted. Obvious how this was produced, but since it might be confused with copper wheel engraving then some explanation of the difference is needed. In wheel engraving the image shows lines of the cutting and the image is almost always further heightened by additional artistic work, plus there is some depth to the image. With sand blasting the result is one of complete uniformity of a dull granular frosted finish, and really no depth to the image - there should normally be no doubt as to which process has been used.
Let's hope some else is able to provide some useful information.