My dad got this when he was a kid. Hes 52 now. Its a National, but no model number on it. I just got it fixed up for his birthday. The guy had to add the bridge under the pickup (although now i wonder why) so thats not original. Everyone i take it to seems impressed but no one knows what it is. Oh and it wasnt originally white, that was a stupid thing my dad did as a kid

It's a Duo Tone, the original bridge was probably broken or warped.
The manufacturer's full name was National Supro.

Eastwood guitars reissued this guitar with some modern upgrades a few years ago.