Probably cheaper, safer and quicker to buy a quartz battery movement (available everywhere) and fit to the face with a suitable adaptor. Similarly fitting the hands to the movement. Will look the same and likely just as accurate.

John

Even if you got it fixed it would probably make scary buzzy electrical noises

Gerry, You could rewind it so that it works on a lower voltage and use a suitable low voltage mains transformer (bell transformer) to power it. I've done that a few times to avoid using a quartz movement.

This link give info https://sound-au.com/clocks/ocm.html Peter

Given that there is most probably only one break in the winding, and that it's most likely on the exposed parts of the coil, the first thing I would do is give it a good coat of looking at under a magnifying glass. If you can identify the break it should be fairly straightforward, if a bit fiddly, to effect a reapir. You can spare a turn or two in order to give enough length to play with, and the soldered repair doesn't need to be particularly elegant, though it's a good idea to slip something insulating under the join to isolate it.. It has worked for me in the past.

As far as I can tell from the photo the yellow stuff is nasty gloop from the sort of sticky tape they used in the sixties, and it doesn't look as though there is widespread corrosion, which is the real killer.

George