the person who filled this hole has really nothing to do in the restoration of instruments, it's not possible to see such a massacre... I've already done this kind of job in a 1981 LP, it's better to put a real identical piece of wood, redo the routing and of course redo several coats of nitro varnish with a month of drying before sanding and polishing. this will improve the tone and sustain because the bridge will be much better fixed and solid