Infantry NCO visor with strange stamp

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Yesterday was Sunday ,a holiday day,having nothing to do I decieded to set up my visors collection.I founded 2 caps I forgot to have ,one is a nco inf. and the other is a trasmission off.
Looking at the infantry I noticed made by Schellenberg or a licensed factory first surprice.The second was pulling over the sweatband I founded the unit number the name ,I think,and a strange stamp!What could be?I never seen a stamp like that.
opinion are required!
Cheers
Carlo

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The last one .........the strange Stamp

[NTZ]

Carlo leave it to you and your fantastic collection to post the missing link I have been looking for. Every stitch of that cap is textbook Schellenberg. The shield has distributor markings. I have been looking to find pics of a Schellenberg distributor cap and here it sits. I knew Schellenberg used distributors but never seen the markings before. Great example!!!! Can you make out the distributors name? The stamp looks like your basic Gepruft too me. The one above, could that be a A.S. for August Schellenberg?