[exray]

Remember this is a 260 kc transformer which is different from the more common later 455 kc types. Plus it has an untuned secondary. They are not hen's teeth rare but unless someone has a donor chassis you may be looking for a while.

I'd suggest to proceed with the rewinding. Nothing to lose at this point. Before starting take it out of the chassis and give it the eagle eye examination. You may see a break or where it may have been nicked. Determine the wire size and get ahold of a roll. (ebay). Attempt to count turns as you unwind it. A few turns of inaccuracy won't be an issue. You'll never be able to rewind it nice and pretty like original but it can be done.