From all appearances it looked like the rite part. When i installed it , it bound up. After grinding off some of the tail, opposite the hook, I got it to work.
I cut over an 1/8 inch off of it.
The driver for the hook is part #12394.
Im not sure whats going on.
It a 1951 Singer 31-15 machine.
The hook that was in it is stamped japan, no part number.
Its a mystery.