M43 Hitlerjugend 'Flakhelper' field cap with RBNr. and RZM tag

Beautiful light worn M43 pattern single button Hitlerjugend field cap in Luftwaffe blue colored wool for a member of a Flak (anti-aircraft) unit. Complete with original hand applied HJ diamond insignia up front. The blue silk liner and leather sweatband show minimal wear. The sweat band is stiff and shows cracks. Maker marked with RBNr. 0/00629/0003, size marked 54 and dated 1943. Also has a genuine machine applied RZM tag inside that says: 'Mütze für HJ-DJ'. Beautiful and stunning cap in excellent condition!