Bendon, James - UPU Specimen Stamps
The Distribution of Specimen Stamps by the International Bureau of the Universal Postal UnionPublisher: privately published, 1988.
first edition, hardback, dustwrapper, x + 260 pages, in Very Good condition.
A handbook and priced catalogue listing all the Specimen stamps (i.e. postage stamps of various countries overprinted "SPECIMEN") distributed by the International Bureau of the Universal Postal Union. Well researched by an acknowledged expert in the field - this is the standard reference work on the subject. 
