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Audio coupling transformer? I read somewheres that the ringer device from an old Ma Bell dial phone from the 50's and 60's can act as a functional replacement, but it looks way different. The ringer has two separate coils, which can be repurposed as a primary and a secondary, IIRC.
Another angle: Sometimes the fine wire used inside old transformers will get corroded by the old rosin used in soldering the wire to the transformer terminal or lead wire. And this corrosion gets severe enough to cause an open. Thus the open break may be easily fixed by resoldering a short jumper lead.
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