Here are 1909S RPM-002 (S over horizontal S) and RPM-001. The overlay for the horizontal is pretty darn close to fitting. I have found that overlays don't often fully answer my questions. But they help. The 001 is so obviously another S an overlay is not needed. Wish the coin's condition was better...
1909S RPM-002 FS-1502 (12.3) S/S horizontal S

1909S RPM-001 FS-1501 (12.2) S/S NE
1909S RPM-002 FS-1502 (12.3) S/S horizontal S

1909S RPM-001 FS-1501 (12.2) S/S NE

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