Note post #1, pic #4; the one with a Canadianicon Arsenals Ltd. stamp.
I wonder if this is one of the 70,000 from a cancelled order, ref: https://www.milsurps.com/showthread.php?t=36140

Canadian Arsenals Limited.—This company was established under the Companies Act
by Letters Patent dated Sept. 20, 1945 and is subject to the Government Companies Operation
Act (RSC 1952, c. 133) and certain provisions ot the Financial Administration Act (RSC 1952,
c. 116). The company was set up to take over and operate Crown-owned plants and equipment.
It manufactures small arms and ammunition components and has extensive facilities for the filling
and assembly ot artillery ammunition, mines, bombs, grenades, rockets and other specialties up
to torpedo warheads. Its Divisions, together with the locations of their plants, are as follows:
Small Arms Division (Long Branch, Ont.) and Filling Division (St. Paul I'Ermite, Que.). The
company reports to Parliament through the Minister of Defence Production