this is a russian carb mounted on old lada -vaz cars , the chokes was 23-23 or 23-25 , some guys used this carb in Romania to replace SOLEX DIDTA , the results was very good . I had using thios kind of carb on a tuned RENAULT 12 ( romanian DACIA car) 1.3 engine and 280 camshaft - the power was around 80 HP ( the original power was 55-60 HP) . Nice antique !!!