Many of the original ceiling lights on my old house were mounted to pancake boxes that had a male threaded nipple in the center of the box. Seems to have been a common box when converting from gas to electric lights. I'd wager it's 3/8 NPT.
source https://www.inspectorsjournal.com/topic/19263-vintage-light-fixture-mount/?do=findComment&comment=178059
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