I belive this is the correct part:
https://www.digikey.com/en/products/detail/nidec-copal-electronics/CL-SA-12C-02/4010211
Thanks. I checked and that is a reverse slide. It is in the datasheet: Position A : 1 - 2. Position B : 1 -3.
Viewing directly on an RGB CRT I can hardly see a difference. But I'm told it helps with some video processors that digitize the analog signal. OSSC for one.
True, I use an OSSC.