Dan,
Interesting images. The B&W image shows three Centurions: the two in the background have 105mm Main armament (fume extractor is not concentric, and is square edged), while the closest is a 20-pdr with the rounded, concentric fume extractor and a single counterweight for balance.
Cents from at least Mk.3 onwards had the gun crutch on the rear left corner of the hull. The mod was required because the diameter of the B type barrel was slightly larger at that point than the A type barrel. The crutch had to be enlarged just a fraction (but not moved).
The colour image shows a Cent with 20pdr main armament moving onto or off (most probably off: no ground guide on the trailer deck directing the driver) a Dyson Mk.3, 50 ton trailer being towed by a Diamond-T tractor.
Mike C
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