What is it from, New Member

Hello every one, First off I do not quite know where I fit in here as I am in to Military Bikes!!! Any clues?

Any way, for now I have a question, one of my BSA Airborne bikes has (as they normally do) a civilian bike sprocket and crank set. However I do not have a clue what it is from.
It looks to have stamped in the sprocket 3 cannons. Dose any body have any idea as to what it is from???
 

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Royal Enfield

Ok thanks, at least I know where the sprocket came from. Won't throw it away then!

So where can I get some chain from & is it an imperial size, or is there only one size standard as R really don’t know!!!
 
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