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Classic Lightweights UK
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Simplex double chainrings

Nigel Scott 
Simplex rings components1 
This image shows the Simplex 'Competition' double chainring.  The sheet behind also shows the Simplex 'Tourist'
version which is a very rare item.
Simplex double chainrings 48/51, weight 400grams. (these came from Horace Shillingford's shop in Leighton Buzzard)

implex rings components2
Simplex produced these 'arms' in flat and offset form