Allparts (note the name) built (licenced ?) Amal carbs in bronze, in considerable quantities sometime around the war years. No makers markings or stampings, not plated either, just bare bronze.
Considered to be quite good quality too, excellent machining,
although the castings tended to be a little rougher/coarser.
Helped alleviate a spares shortage, and kept many a bike on the road.
A number of bikes today still use them, if you you keep an eye on such things...
That one looks to have been bead blasted, takes away the natural bronze colour.
Maybe the 'patina' will come back in time ?