This is an amazing find - a bar brooch featuring a slice of the 1890s Trans-Atlantic cable which was produced to link the Americas to Europe.
Apparently, many souvenirs were produced but I have been unable to find another. It is in super condition considering its age, of which it does show a few small signs. 
Please see the history below. NB: pic 2 shows samples of the Trans-Atlantic cable produced by Siemans in Woolwich, London, of which this pin bears a slice!

Postage/Returns

I shall post by Royal Mail Special Delivery. If I am in the wrong, i.e. have described the item incorrectly or misled you, I shall provide a refund without hesitation.

Thank you for your interest.

A little history

This is a very special piece with a wonderful back-story. It is a Victorian souvenir brooch made from a slice of Trans-Atlantic cable produced by Siemens Brothers in Woolwich, London. The cable was manufactured by the Victorians to enable communication between the Americas and Europe. 

The construction of the brooch's cable dates it to the latter part of the 19th century - the key is in the layout of the copper conductors at the centre of the cable. If you count the copper wires, you'll see there are twelve small wires wrapped around a much larger wire at the centre, and this is the design used during that period. As well as copper being used in the process, Russian Hemp, Manilla yarns, steel, India rubber, and jute were also used.