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 know what red T mark means.
19mm mount thread.
I'm not sure waht exactly is this objective for, but my friend supposes that it is purposed for some measuring microscope. If you know for sure, your information will be highly appreciated and published with credits to you.
Rings are not moving, so it needs lubrication.
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