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That's what I thought but couldn't remember what the cable innards were made from. The sparx I work with most often is very vocally not a fan and will always advocate replacing it with copper, although to be fair the two houses we were working on when it's cropped up in the past had wiring that was so dodgy that in his opinion if there was ever a fire the homeowner would be at risk of being arrested for insurance fraud
Bobbo
I thought it looked like Aluminium cable which was popular late sixties early seventies if I remember correctly. I've only worked on one or two places with that type. In my small sample set they seem to be vulnerable to wires working loose in connectors.
The figures for capacitance are different but it would be susceptible to breakdown in the insulation at that age. An insulation resistance test would give you an idea of the condition.