Germany, Rlb. A Reich Air Protection League (Rlb) Berlin Group Door Plaque certificate_of_authenticity There is a single loop

There is a single loop for the ribbon bar just above

reverse with Leopold II monogram also on a nice blue background

150x105mm)

also known as Gothic letters

but when I got to it

Germany, Rlb. A Reich Air Protection League (Rlb) Berlin Group Door Plaque certificate_of_authenticity There is a single loop(Reichsluftschutzbund Trplakette). Constructed of bronze with enamels, the obverse with a central blue enameled RLB insignia on a raised eight pointed radiant star, circumscribed by an inscription of MITGLIED DES REICHSLUFTSCHUTZBUNDES LANDESGR. BERLIN (MEMBER OF THE REICH AIR PROTECTION LEAGUE BERLIN GROUP), with two holes for attachment, unmarked, measuring 72 mm in diameter, in better than very fine condition.