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@fruitbat
Shell looks in really bad condition, but if you can find a model identification (which will be mostly letters) and a for digit date stamp (which will give you month and year of manufacture, then look here;http://www.sheldonbrown.com/sturmey-archer.html
Or here, http://www.users.globalnet.co.uk/~hadland/gear.html
Sprocket is held on with a circlip, my guess though is that it's not worth spending too much time or money on.