Original brass Hotchkiss hubcap, probably of a 40HP car.There is a nick out of the edge, otherwise it is OK.The outer diameter is 4".I can post this, and I accept PayPal.
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.