so I've checked the sites (yours and Sheldons), and I think I got one of the early 60's Raleigh Superbes.

The numbers on the underside of the BB is 22752. No letters.
However on the top of the lug which connects the seat tube and the top tube has got the number 2134212 stamped into it as well. Again no letters.

Checking the hub does no good since it seems to have been a miss stamp at the SA factory. Only half the logo is stamped on it. The model, and date are the part that is missing. As is some of the other info usually stamped on the hubs. I think I can see faintly when going over it with a pencil a number 1, buts it's only the top half of the number (luckily it's got that 1 tail.)

Here's a couple pics.




It didn't come with the lights, Dynamo, tool bag, or pump.

Shifter is metal, no gear numbers or window. Red circled R caped nuts.
Plastic fulcrum. Raleigh peddles. Nice gold pin striping through out. Lugs on seat tube and down tube for the chain guard. Pump mounts.

Oddities: no white tail on the rear fender, the color banded stickers on the seat tube seem to be not factory in that unlike the others on the bike, they aren't under the clear coats, or are thicker paper stock than the others.

Lemme know what you think/know. Mostly I just wanna help with your quest to figure out the numbering system. I love the bike and really the only info Im interested in is if it was probably a front or rear dynomo so I can rebuild it.