 The 8¢ surcharge was made in Panama on Colombian stamps already overprinted with a red colored bar and the word "PANAMA" and occurs in varying thickness and forms.There are three varieties of the '8' in the surcharge.Postage stamps issued in 1906–1907 were printed by the Hamilton Bank Note Engraving and Printing Co, in New York; Those issued in 1909 were issued by the American Bank Note Company.