Riley RMA, AC Ace, MG TC and very early MG TD 3229Q SU 1 1/4 inch original factory carburettor

this is the factory original carburettorfor the Riley RMA ,AC Ace and often used on the  MG TC,MG TA , MG TB and very early MG TD.the carb is in very good condition as it has sat on a shelf for the past 50 years.it has been cleaned and new Viton seals fitted in place of the cork seals, everything moves freely and the weighted piston drops easily without sticking The weighted piston is the later type alloy, with a steel weight collar as used in the late MG TC and early MG TD.,most of the early MG TC's used a brass piston. I have shown this piston in the photographs .THE 

The carburettor is the prewar and immediate post war Mazak alloy,the physical dimensions of this carburettor and operation is identical to the 3678 B  as used on the MG TC