MD and die chip as mention already. Check Wexler's site for where to look for doubled dies on this series:
http://doubleddie.com/1801.html
This is the home page. A lot of information. How to use? Note on column on the left, there is one that says:Doubled Die Listings Then choose: America The Beautiful 25¢ Doubled Dies. The choose: North Carolina - Blue Ridge Parkway That will open you to the screen for obverse and reverse listings. That page will help you see where to look for known doubled dies. Then look in those areas or even a bit beyond those areas. (you were correct to look in the center of the design) Hope this helps.
CoopHome : How to Wexler site
http://doubleddie.com/1801.html
This is the home page. A lot of information. How to use? Note on column on the left, there is one that says:Doubled Die Listings Then choose: America The Beautiful 25¢ Doubled Dies. The choose: North Carolina - Blue Ridge Parkway That will open you to the screen for obverse and reverse listings. That page will help you see where to look for known doubled dies. Then look in those areas or even a bit beyond those areas. (you were correct to look in the center of the design) Hope this helps.
CoopHome : How to Wexler site



















