It's for a front mech obvs, you can see where a front mech cable ran round the BB shell.
And then where does the RD cable go?
I'd imagine the inner cable for the RD comes out of the little hole, through the guide, along to a cable stop on the DS chainstay and then into a section of outer cable taking it to the RD.
@PhilDAS started
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It's for a front mech obvs, you can see where a front mech cable ran round the BB shell.