This is a 2.5 mHy part with 9 ohms DC resistance.

   The core is ceramic measuring 2½" by 9/16".

   The six pies, spaced ¼" on center, are wound with green wire and measure 1-1/8" outside diameter.

   The contact bands are fastened with screws and soldered.   Note: as far as I know, Bud, Johnson, Miller & National parts all employed riveted bands.