Marine-HJ (ie. 'Marine-Hitlerjugend') arm-badge aka: 'Ärmelabzeichen Reichsseefunkprüfung B' (or naval-HJ, radio-proficiency badge of the 'B'-grade)

This is a neat - and actually quite scarcely encountered! - so-called: Marine-HJ (ie. 'Marine-Hitlerjugend') arm-badge aka: 'Ärmelabzeichen Reichs-Seefunkprüfung B' (or: naval-HJ radio-proficiency badge of the medium ie. 'B'-grade) and that comes in an overall nicely preserved- (I deem just mimimally used- and/or tunic-removed-), condition. The neat (circular-shaped) badge - which is excuted in bright-red-toned linnen onto a darker-blue coloured- and woolen-based background - is piped with a red-coloured, twisted 'cord' as per regulation. The badge depicts a machine embroidered (ie. bright-red-coloured anchor-device with below a double 'chevron' denoting that it deals with an insignia-piece of the medium- (ie. 'B'-) grade). The badge is void of an 'RzM'-etiket (which might have been lost over the years) and is just a tiny bit stained caused by years of storage only. The piece is neatly backed with a piece of black-toned linnen as more often. Simply a very nice - and actually unusually encountered! - Marine-HJ 'signals-related' insignia-piece!