DC & US Territories Quarters
The same restyled Washington portrait used on the State Quarters, facing left. Six one-year designs honoring the District of Columbia, Puerto Rico, Guam, American Samoa, the U.S. Virgin Islands, and the Northern Mariana Islands.
Composition
Key dates to look for
2009-D Territories Quarters
Face value circulated; $1 – $3 uncirculatedNorthern Mariana Islands — about 37.6 million made, among the lowest quarter mintages in over 50 years
2009-D Territories Quarters
Face value circulated; $1 – $3 uncirculatedAmerican Samoa — about 39.6 million made, nearly as scarce
2009-D Territories Quarters
Normal coins face value; doubled dies $25+District of Columbia — check every one for the doubled die on ELLINGTON
Valuable varieties & errors
2009-D District of Columbia Doubled Die Reverse ("Doubled ELL")
scarceSeveral Denver reverse dies for the DC quarter, which features jazz legend Duke Ellington at his piano, were hubbed with visible doubling. The strongest dies show bold doubling in the word ELLINGTON, giving the variety its nickname.
Error types found on this series

Doubled Die (Reverse)
Same as a doubled die obverse, but the doubling appears on the back of the coin.

Grease-Filled Die (Struck Through Grease)
Grease and debris packed into the die's recesses blocked part of the design, leaving weak or missing details.
Missing Clad Layer
A dime, quarter, or half is missing its outer silver-colored layer on one side, exposing the copper core.

Off-Center Strike
The blank wasn't centered when struck, so part of the design is missing and part of the coin is blank.

Die Crack
A crack in the die fills with metal during the strike, leaving a thin raised line on the coin.

Clipped Planchet
A bite-shaped piece of the coin is missing because the blank was punched from an already-punched part of the metal strip.
Real photos where available (credits); others are illustrations.