Yes this maker mark did exist. was for C.Gustav Spitzer. 1937ish .
they made SS daggers in 1937, 1938 , & 1939.
this was their S.A, dagger mark.
other seen SS marks...
1) m7/80 (and below) rzm 1197/38ss.
2) m7/80 (and below) 1197/38ss.
3) m7/80 (and below) 1197/39ss. few variations of this one seen.
jeff