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Why do a pair of horizontal bars suggest a gas lamp? Well, since the lamps required lighting every evening, someone had to climb up to do it. Obviously, a narrow cylinder isn't the most stable of ladder supports so the bars at the top provided a safe anchor point over which to hook the ladder.
The detail around the bottom isn't very sharp, thanks to repainting. However, there's an image of a building which could be the Tower of London and the letters 'BW'.
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