17mm Amal cable choke carburetor. These are high quality Spanish carburetors with more tuning options than a Dellorto SHA.
Can be used on intakes with a 19mm (SHA intake size) outer diameter with shim or remove the shim and use on 24mm (PHBG size) outer diameter intakes.
Motobecane SHA intake - 19mm
Motobecane PHBG intake -24mm
Puch intake -24mm