Fitted to my porteur is this rather nice novelty of a French alloy and steel bell… The Couco-Coo. You can hear what it sounds like here! It has a very simple mechanism which cleverly strikes the alloy top bell first and the steel lower bell on the return stroke thus making the couco-coo sound! There is a cockerel embossed into the lever and the name is on the other side.
Vintage Bicycle Blog 
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