Decca 94 radiogram service sheet needed.

[Terry]

So its either a new one or a rewind, does anyone know what weight of copper wire is likely to be needed to rewind it?

Why not unwind the faulty one and weigh it?

I don't know how accurately modern metric wire sizes agree with the nearest equivalent SWG so you may need to allow extra for that.

I'm assuming you have a coil winder (or there is plenty of room on the spool). Otherwise you'll have to allow extra for hand winding as well!