Lot 50085 – Southern Nigeria – 1903 £1 & 1906 £1, group of 17

Southern Nigeria – 1903 £1 & 1906 £1, group of 17 items displaying cancellations of Bonny and Sombreiro River, including: the four genuine stamps (one torn) which Sperati used to reproduce the cancellations, which were chemically treated and, with the addition of pressure and heat, its design was made transparent to light and only exhibited the cancellation; six clichés on celluloid and eight essays on paper of these cancelations with manuscript comments of Sperati complete the lot. Absolutely unique and exceptional.