Interesting postcard.  Printed in Germany, published in London.  It’s pre-WWI.  Addressed to a party in Gate City from “Guess Who” in Kingsport, but never mailed.

The “London E.C.” stands for London’s East Central Postal District.

B & D, Pictorial Post Card Pioneers, (Blum & Degan) operated in London from 1885 to 1908, when they went bankrupt.