NOS Huret Down tube shifter clamp 1-1/8

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NOS Huret Jubilee / Alvit Downtube Shifter Double Clamp: #1852 - 1

SHIMANO 600 DOWNTUBE SHIFTER LEVERS 28.6mm CLAMP LEVER VINTAGE

Huret Downtube Road Shifters NOS Short 70s Cl-On 1 1/8 28.6 Allvit

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Loose Screws Bicycle Parts – Vintage Bicycle — NOS Shimano and Suntour

Has any MacGyver out there figured out how to build this? - Bike

Huret Jubilee Short Cage Rear Derailleur 1970's Vintage France