There's a comment at the bottom from one Bruce Henderson who says:
"I was very interested to see this item imcluded in the list of 100 objects. My GGgrandfather, George Draper was, for 35 years, secretary to Eastern Telegraph co, which was the company that operated the telegraph systems round the world. In the year of his retirement, 1903, there was an International Telegraph conference in London. I have a book of cuttings and invitations to the various events held. Telegraph Construction and Maintenace Co , of London, which manufactured and laid the cable; notably the original transatlantic cables, using the good ship Great eastern."
It would be fascinating to contact Mr. Henderson and find out what he's got -- unless PTM staff have already done so? Has anybody heard of him?