SEV distributor cap 6 cylinder.
Outside diameter 65 mm.
Sev made two sizes : this is the smaller of the two.
used on : f.e. Delahaye , Talbot Lago, Citroen etc.
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..