The cuff has now been completed and collected by my customer.
It actually had two incarnations as a “finished” object. Initially, the piece had a differential polish showing the binary nature of the alloy with one side being fine silver and the internal surface polished to the bare alloy which has a paler tone than copper.
After the customer saw the object in person, it was decided to proceed with a full polish. This was done with 800g paper and wire wool to finish.