Steinhauer und Lueck had the license M1/63 after the 1935 reform of RZM nomenclature. I have never seen a Danziger so marked that I deemed to be real.
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The fake Danziger I have seen is with the mark M1/25.
Those who care deeply about this are well advised to shell out the USD 150 for the RZM Handbook, for which I only paid USD 5000 for the real deal, and you can memorize all the license numbers in their hundreds of thousands.
Looking forward left prongs attachment is little supicious this way could be not orginal
This way right side also could be not orginal.
As a wrote previously those type of prongs are not so common for Danziger type skulls
But I could be a wrong
Does you remember my Deschler witch strange pins attachment ? (: