Wingspan is 3 with its original brass loop fasteners. In this condition it is most likely a surplus piece, Bannerman or Sykes. Please judge condition for yourself by the pictures. See: Campbell and O'Donnell's page 93., figure 191.
The item "Original Pre-Civil War 1821 Pattern U. Officer Bell-Crown Infantry Badge" is in sale since Monday, July 5, 2021. This item is in the category "Collectibles\Militaria\1784-1860\Original Period Items". The seller is "yjmilitaria1998" and is located in Waterbury, Connecticut.This item can be shipped worldwide.