The term Frontbann (lit. 'Front Regiment') refers to a reorganized front organization of the Sturmabteilung or SA which was formed in April 1924.[1] It was created to replace the SA which had been banned in the aftermath of the failed Munich Putsch. It was disbanded in February 1925 after the ban on the SA was lifted.
The Frontbann Badge (or Frontbannabzeichen in German) was introduced in 1932 by the SA Group Berlin-Brandenburg to honor the members of the Frontbann organization.
This badge was awarded to individuals who had joined the Frontbann before December 31, 1927, and who also had been members of the Nazi Party or another right-wing paramilitary group prior to that date. 
In 1933, it was officially recognized as a Nazi Party decoration. However, by the end of 1934, the badge was no longer authorized for wear by members of the NSDAP.
This example looks as if the pin has become detached and glued back on but still completely original. It’s priced accordingly for this small fault.
Made by the well known maker BSW and has there trademark stamped to the rear.
Very rare to find badge.