Tells the fascinating and complex story of the proprietary coils developed by manufacturers of stamp vending and affixing machines in the early 20th Century. Covers more than 250 major varieties of coil stamps made by the six companies that created these perforations, discusses their history and proprietary perforations, stamps to which the perforations were applied, scarcity of these stamps on and off cover, and factors to be considered to identify the many fakes of these coils. Illustrated in full color; 220 pages (2009), Hardbound.