I have a request of Mr. Stephens. If all the examples I've and others have shown are copies/reproductions/altered, then please show us one original.
A quick search produced the web site listed below and I ask those reading this thread to have a look. It shows a wide variety of silver marks used by different German manufacturers� post 1886. Though, not Third Reich specific, it demonstrates a magnitude of possibilities and should be considered before ruling the mark found on the NSKK High Leader Chain to be fake. I'm sure with additional research; these marks will be found period and used by Gahr.
http://www.925-1000.com/Fgerman_marks_a1884.html
