From a deceased estate , I think these SU;s are prewar but although they are similar are not a pair , one has a 10oz bronze piston the other ali piston and spring combination 10oz , both in good condition but will need new butterfly spindles , the rear flanges are not distorted
Broken down. Not working. Could bake a working engine from the 2. Found in grandfathers / uncles garage along with large amount of other de Dion parts..