As Ade says, everything points to a Lithgow gun, the boxes for the gun and tripod look Aussie (Possibly Slazenger) and the white armoured vehicle ammo box is Aussie. The serial of the gun will be pre fixed with a 'A' or 'B' and the tripod will be marked along the top with RT and a date, the RT being Randwick Tramways of Sydney Australia.
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