OTHER HANDMADE, Clambroth. Smithsonian Magazine Marble. Black Clambroth. Opaque black base with nineteen white strands on it. Surface has a couple tiny pinpricks, but is still original and in remarkable condition given it's age and size. Still has Bert Cohen's label on it reading "Smithsonian Cover 4/88". A phenomenally rare marble, even without the provenance. Germany, circa 1860-1920. A rare opportunity to own one a marble shown on perhaps the most iconic marble image of all time, the April 1988 cover of Smithsonian Magazine, which has been seen by hundreds of thousands of marble collectors and non-marble collectors. The marble comes with an issue of the the April 1988 Smithsonian Magazine. Provenance: This marble was pictured on the cover of the April 1988 edition of Smithsonian Magazine. The marbles pictured on the cover were from the collection of Bert Cohen. Subsequently, the marbles passed to his son, Arnold Cohen. The consignor aquired this marble from Arnold Cohen. 2-1/8". Mint(-) (9.0).