Interesting, dont know that ive seen another.
Strange, and maybe because I have not been looking for one, but in over 40 years of military, gun shows, and an extensive library, I just cant recall seeing one like this. Anyway, the lettering on the front looks like the same type of font I have seen on other TR tinnies and whatnot. The backing fabric looks suspect, strange color, or maybe just the photo? Sorry I cant be of better help, but I will hang around, I just might learn something.
I know they should be curved to fit on the arm. Also should have mounting holes. Should also be a hollow back construction.
The backing I am not sure of, not many reference pics.
I hope Mr Wim Saris doesn't mind me using this picture if so I offer my sincere apologies. It is from his book headgear of Hitlers Germany volume four page 489. Theres not a high resolution image of the badge itself. But it does give a good visual reference point as far as size and style. Plus its nice to see one in period wear. To think outloud I rather like the piece you show. It has fairly good detail especially to the feet/wreath area and to the lettering, also the reverse seems to show a very consistent thickness around the backside perimeter edge. I hope someone who has handled these personally will come along and be of more assistance? Until then best of luck and thanks to wim for his hard work to provide resources for all to learn. Best regards.
NSKK Traffic Education Service Arm Shield
Here's another from germanwarbooty's archive. Again compared to the one you've posted I still like it. But as stated never handling one before I cannot say one way or the other. What's the asking price for your example if you don't mind me asking? Again best of luck with whatever you decide upon. Best regards.
"Wir sollen auch unser Leben für die Brüder lassen" (1.Joh.3.16):
zum Gedächtnis Wilhelm Schenk. Er starb fürs Vaterland am 13. Juni 1916