Unidentified part... can you help?

[clipi]

Hello I got a budle of microscope parts with condenser, lenses, etc.
One of them I can not identify. It does not have any part number or manufacturer.
It look like part of a photo tube for camera.
Hope somebody can recognize and let me know.
Thanks!!

part1.jpg (82.71 KiB) Viewed 2114 times

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part4.jpg (66.47 KiB) Viewed 2114 times

part2.jpg (66.12 KiB) Viewed 2114 times