Watch List notes:

Victoria, Golden Jubilee 1887, an unusual group of green vulcanite medals, by Messrs. John Pinches, for the India Rubber, Gutta Percha and Telegraph Works, Co., Silvertown, East London, crowned bust three-quarters r., rev. Britannia seated on globe, Empire pioneers to either side and a cable-laying ship at sea beyond, 38.5mm. (BHM.3273; W&E.2315A.1), mint state (38)
The India Rubber, Gutta Percha and Telegraph Works company entered the business of laying submarine cable as well as manufacturing cables for other companies engaged in cable laying. During the 1880a some of the first Bell's patent telephones were manufactured at the Silvertown plant.

Estimate: 100 - 150 GBP