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The Priestman had a sliding counter weight, you can see it at the base of the boom and that is what the cables are for. I think that they were the, or one the first long reach hydraulic machines made, in the UK at least.
It is a Priestman. The two most common long reach types are the VC15 and the VC20, 15 and 20 metre reach. The VC stands for variable counterweight which was pushed back by a ram at the rear of the machine which inturn pulled a cable which pulled the stick out. A hydraulic motor on the underside of the boom pulled the stick in and the counterweight simultaneously came up the boom letting the stick fall.