The MW&S Ltd 1916 web strap was a bit of 'red herring' as this packboard is related to the 1950s Heller.
The Heller was a Canadian 100mm antitank rocket launcher produced and fielded in 1954 and subsequently replaced by the M20 3.5-Inch Rocket Launcher and the 84mm Carl-Gustaf after 1967.
It was during the early 1950s trials process for this weapon that the Experimental Archibald Utility Packboard was developed so that the Heller Loader could carry six rounds. The webbing on this packboard is a mix of 1908 and 1937 pieces with many showing signs of having been modified by a textile worker.
I cannot confirm that this packboard was ever adapted and suspect it was not as there were other packboard systems already in use that could be employed to carry the ammunition.
