Well I thought I had scored a Twenty off of Ebay, but when I got the bike, it's not. I should have realized the hinge wasn't the same, my own fault.
But now after some more fruitless research on the web, I'm intrigued.
It is a Raleigh, with a "Made In Japan" sticker, along with the SA-3 Hub Stating fabrication in March of '81.
It's got 16-inch wheels. Everything on it looks appropriate for age and assembly on the bike, other than what appears to be updated cranks (and bottom bracket?)...I just can't find any information on any folder's by Raleigh as late as 81. The folding hinge doesn't match the RSW either.
The serial number stamped on the Seatstay bridge is S1F92319...which doesn't seem to match any Raleigh numbering methods I can find online.
I've attached a couple of pictures...anyone have any ideas what stripe of beast this may be? I'm still thinking about cleaning it up as one of my commuters.