MD-55. 1 March 1770 $1 (4s6d) Maryland note. Printed [Annapolis, Maryland]: A[nne] C[atherine Hoof] Green and W[illiam] Green, [1780]. Serial no. 6152. Signed by Robert Couden and John Clapham. Printer's imprint and nature print to verso. 4 3/4 x 2 9/16 in. 

An extremely fine example of a Maryland colonial note, importantly printed by female printer Anne Catharine Hoof Green (ca 1720-1775) and her son William. In 1745, Anne and her husband Jonas Green (ca 1720-1767)  began publishing the Maryland Gazette, one of the first newspapers published in America. After his death, Anne took over as editor and printer of the Gazette as well as other printing contracts for the Maryland Assembly, including paper currency. 

The nature prints featured on the versos were originally cut by Anne's husband Jonas Green for the 1756 issue and reused in bills printed in 1767, 1770, and 1774. Inspired by Benjamin Franklin & David Hall in Philadelphia (and later William Sellers), the intricate prints acted as a safeguard against counterfeiting. Additionally, notes of this issue included "secret marks," here on the $1 denomination, each "N" in "INDENTED" is rotated 180 degrees.

References:
Bruce Hagen & Stuart Levine. Continental and Colonial Currency. 

Eric P. Newman. The Early Paper Money of America. 

Jennifer L. Roberts. "The Veins of Pennsylvania: Benjamin Franklin's Nature-Print Currency." Grey Room. Issue 69 (2017). 

[Currency, Tokens, Medals,  Numismia, Numismatics, Exonumia, Bonds, Coins, Banknotes] [American Revolutionary War, American Revolution, Founding Fathers, Declaration of Independence, Colonial America, George Washington, Thomas Jefferson, Alexander Hamilton, James Monroe] 

Slabbed and graded by Paper Money Guaranty (PMG) as "40 Extremely Fine".