Dunlop Special Lightweight rims - Tubs or Clincher?

They're not clincher or tubs, clincher or hook/bead rims came in in the late 50s, you can fit a beaded tire to these but you won't be able to use much inflation pressure, if you're lucky maybe 40 or 50 PSI.
If you use more pressure the tire will unseat, nice rims by the way...

Right, so what kind of tyre would of been used with these rims to get a higher PSI? And can you still get them?