Here is the Armour page from Stephen Talberts formation book. This shows the diamond but I am confused by the lettering as it is nothing I can find so far in Australian information I have which is why I beleive it may be British or Canadian.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"