I have just dug two air bottles out of the back of my gun cupboard - they are:

3 Lt - 232 bar - with carrying straps/handle
Takes an A clamp - no hose/gauge.
Manufactured 11/97 currently out of test.

12 Lt - 232 bar - with rubber boot & mesh cover sleeve
Takes an A clamp - no hose/gauge.
Manufactured 11/97 currently out of test.

Both are in pretty good nick and I think they should sail through
the test.

What are they worth.?

Cheers Gary