They are single cylinder, (as in, can only open from one side) brass casing dimple key type. Have taken one apart and taken pictures, (to follow, once I find my card reader). Anti-drill pins x 2, spools galore, and more pins than you can shake a rather hairy stick at.
Your thoughts on picking etc ?
Have also got a load of Mul-t-locks, one of which I've taken apart for pics and investigation, but you don't get to see those.

G.