The number might be a house number, though it seems strangely familiar. I can't find it in my Arnold, Amidon, or Micrometals catalogs. If you have a way to measure inductance, it's not hard to wind a known number of turns on it, then calculate mu, then compare it with various catalog types for material. I do that with most of the surplus hamfest toroids I find. If you want to do that, I'll look up the formula.
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