The Secret Mark on the 30¢ Hamilton Bank Notes
National and Continental Bank Notes
No secret markScott 143, 154 and 165 - The upper triangular protrusion in the letter "S" of "CENTS" is narrow and distinct. The National printings are a full, rich black and the Continental printings are a duller to even greenish black.
American Bank Note Company
Secret MarkScott 190 - The upper triangular protrusion in the letter "S" of "CENTS" is widened and less distinct. This "secret mark" appears on some but not all of the Scott 190s.
