Machine Cancel Group, of over 30 better machines on covers and cards; includes American Postal Machine Company, Boston, Mass. usages, Barr-Fyke Machine Company, Geary National Supply Company, Bradford, Pa. usages, Groth-Constantine Machine Cancel, Washington, D.C., Potter and Vail Machine Cancel, Chicago, Ill. Type J-2, Unknown Manufacturers including popular Pittsburgh, Pa. fancy Shield Hanmer Type 3, etc.; many scarce to rare items, inspect. Estimate  $1,500 - 2,000. $0 (Image)