Zeiss Apochromat microcscope objective 30x 0.65-0.30

I don't know anything about this objective, but it seems like expensive to me ;-)

Apochromat. 30x magnification. Variable n/a - 0.65-0.30. Works without cover glass. Infinity tube.

I don't knwo what red T mark means.

Rings are not moving, so it needs lubrication.