Antique Glass Lampshade, Lighting, Industrial, Vintage

Thank you for looking.
This is an old glass lampshade.
I believe it is an old item because it uses slotted screws (see image 6).
It does not come with a socket or cord. Only the shade is included.
As shown in image 11, there is a ring-like object inside (purpose unknown). I used to place the socket below it.
The light bulb cord can be inserted through the hole shown in image 15 (the hole is approximately 6.7 mm).
It is heavy (approx. 3 kg).
Since the glass pieces were shifting and creating gaps, all the glass has been bonded together with glass adhesive. There are traces of adhesive as shown in image 17.
The part shown in image 16 is likely brass, but the black parts around the edges did not attract magnets, so they are not iron. It may be brass, but the material is unknown.
Would this be of interest to those who like vintage or industrial items?
There are scratches, dirt, etc.
Please refer to the images for dimensions.
We ask for your understanding before purchasing.

We have cats.
There is a smoker in the household.
Please refrain from purchasing if you are concerned.

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