Lymans............, yes! The waterproofing was abysmal and nobody really knows just what the clicks truly equate to. And without a range scale to work from, well...... As a hunting scope they might have been on the better side of 'dire' but quite where they fared on the richter scale of sniper telescopes is, well..................
It's strange that you say that the Lyman TP No4T's were still in CanadianOrdnance but this doesn't mean that they were in the Canadian Order of Battle. If they were, there WOULD be a user handbook available, even if it were a simple pamphlet for instructors to use. Like the 7.92mm Bren. And there wasn't one for that either! Without that, how to they teach?
My view is that these no-hopers were off loaded to the needy emerging European armies first
On the subject of the No67 version, would there be a demand for repro No4T/No67 butts?
There is a No 53 scope on that auction site