Good question....perhaps to replace damaged tripods? There were, after all, 500 of the telescopes kicking around. There is more than the Britisharmies needs to consider....the Cdn Army was still a reasonable size thru the cold war.
I have only seen one of the CAL made examples, which is the one Colin now has. No idea how many Cdn Arsenals made. One has to wonder how much of REL was adopted into Cdn Arsenals. Cdn Arsenals later rebuilt and upgraded the REL binoculars, and were also involved in upgrading the early radar trailers.