A very nice and rare flag here. The NSRKB (Nationalsozialistische Reichskriegerbund) was a veteran's organization in Nazi Germany, established in 1938 by consolidating all German veterans organizations into one nationalized organization.
Two-piece construction silver with black enamels with the Stahlhelm insignia applied to the obverse; Maker marked, “Ges. Gesch.”, and the recipient's membership number and induction date on the reverse. This is an exceptionally early badge with a low number and is quite desireable.