Photo from the collection of Rustybicycle. If you think you know what this is, post your answer in ‘comments’ section– the answer will be posted there on Tuesday!
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It’s a Simplex De-multiplicator, used often on bikes with bar end shifters to shorten the lever throw. One cable goes from the shifter to the De-multiplicator, which moves the fulcrum and activates the second cable that goes to the rear derailleur. Worked like a charm on my Alex Singer randoneur.
Mark was actually more right, a quick google turned up http://budgetbicyclectr.com/simplex-demultiplicator-relay.html
“A nice little cable stop that makes the shift lever actuation a little less sensitive. Never mounted, never used. “One side is connected to the right hand control lever, the other side to the rear derailleur. The purpose is to spread the movement of the lever making gear changing a positive no fumbling operation, especially on close ratio freewheels.” Mostly used with Bar end shifters.”
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