Never before seen, hand-embroidered presumably OT- (ie. 'Organisation Todt'-) related trade- ie. special-career-patch that comes in a 'virtually mint' and/or never tunic-attached, condition

This is a neat - never before seen and still 'virtually mint' - example of a presumably OT- (ie. 'Organisation Todt'-) related trade- ie. special-career-patch (?) that comes in a possibly issued- albeit still 'virtually mint' and/or (I deem) never tunic-attached, condition. The patch shows a detailed, hand-embroidered 'Zahnrad'-device with in its centre the TN-characters and is embroidered (in silver toned braid) onto a typical OT-type, black-coloured- and/or woolen-based background. The oval-shaped patch measures approximately 5 x 3,6 cms. and shows a paper-based, addtional 'backing' as is more often encountered - shows hardly any wear nor age. I could not find an exact determination for this interesting badge (something that is valid for more similarly styled, OT-related trade- ie. special-career-patches). Simply a neat, presumably OT- (ie. 'Organisation Todt'-) related trade- and/or special-career-patch that will be impossible to be upgraded and that is priced according to it obvious scarcity: I deem that this example would merit further investigative work!