Lot 50538 – Indian States, Gwalior – 1882-89 1r, the un-overprinted

Indian States, Gwalior – 1882-89 1r, the un-overprinted design used by Sperati, a negative glass cliché made in order to produce the stamp with genuine Indian Convention States stamp issues with the design washed out but the overprint retained. One of just two negative clichés known.