That was the historical title given to the city of Birmingham back in centuries when there was actually a manufacturing industry in the area. This image was taken in the city's Museum of the Jewellery Quarter which is a house-sized workshop typical of the Jewellery Quarter - a fascinating area of a square mile or so, pretty well totally dedicated to jewellery manufacture and still a national centre for this sort of work. Image mildly grunged using a Filter Forge plug-in.

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Jon