hello strife
assume you are saying that the metalwork lacks hallmarks - the date letter of which would help with dating (at least for the silver). Do you know the whereabouts of Ryrie Bros.?
My suggestion would be that if this collar lacks hallmarks, then probably it's origin is not the U.K.
Did you purchase this in Canada?
Combinations of silver and glass are often sourced separately, so not easy to be positive about origins. Would be good if you are able to post another picture showing the underside - just possible it might provide some additional information.
Regret I can't help, but fingers crossed someone might have the answer.
