It’s got this bit. Is that good?
I’m going to guess it’s not.
The brazing on the left hand chainstay is for the torque arm of a rear hub brake, so yes it's good if you've got the right hub that fits it.
I can confirm that Cyclo rear mechs can be mounted on a bolt on bracket - that's how mine is fitted (see some way back in this thread).
@clubman started
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It’s got this bit. Is that good?
I’m going to guess it’s not.