I have one, too! Only, mine is called "National" Two Spool. Macybaby also has one (her DH claims ownership of that one, though)! LOL
The spool canister for these machines is very expensive. Despite knowing that e-bay is way over-priced (INMHO), there was a listing for one of these canisters, with the bidding starting at $300.000. Now, that's way more than I would want to pay. I'm glad mine had the spool when I inherited it from my aunt! There are photos in the photo section for Vintage an Antique Machines!
Jeanette