I have one too! Mine says "Eldredge Two Spool" but it was made after National took over. Mine is a later model. I think National brough back the Eldredge name for nostaligia. I have the original Certificate of Warrenty from National and it is dated May 1930
Looking forward to seeing pictures of yours - here is mine (well, my DH has informed me it's "His" machine LOL!)