So I got this almost by accident - I didn't actually expect to win the auction, but here it is :) Just the shell, no hardware of any kind. Now I don't know much about Slingies of that era, but I did some poking around and here's what I think - any info or comments are welcome...
The ad stated that this is a 14"x7" 1940s 3-ply shell, no extra holes, that's been painted over and that the badge is fully original and untampered. The part about the 3 plies seems to be true, this would make it a Student model (mahogany-poplar-mahogany and maple re-rings). There is a faint line on the re-ring, right below the bottom of the bearing edge, the ring itself is about an inch thick. So far, this seems consistent with late 1940s/early 1950s drums. The part about no extra holes isn't true - someone drilled a couple of them to fit a muffler other than the original (look to the left of the original holes).
The part about being painted over is obvious - yes it has, all the way to the bearing edge and over it. I used 320 sandpaper to try and clean them a bit, but I didn't go as far as the plies. There's no seam as such, but an overlap of about 4" - not really sure if the drum had ever been wrapped or not. The badge seems to have been painted over or something, not sure whether it's ever been removed.
Alex