The National air protection league was formed in 1933 and made up of civilian volunteers. The helmet insignia changed to the winged Luftschutz decal in 1938 (source L Baer), the helmets also received a different paint color.

Observations :

• RLB decals are only observed on light weight M34 shells
• Helmets are predominantly found with apple or pea green paint , earlier examples have grey paint.

Reichsluftschutzbund – M34 early style with bulgy vents

• Has the uncommon green colored version of the RLB decal , notice the different graphics as compared to the blue decal.

Photos courtesy of Ron R

 

Reichsluftschutzbund – M34

Photos courtesy of Langemarck

 

Reichsluftschutzbund – M34

• Version with the small decal.
• RLB stamp under the leather