Antique ceiling and table lights - Czechoslovakia?

I have this from my late Nan's home. They were working when we took them and one ceiling and the table light both have the original wiring. All 3 in good condition considering age.

Must be at least 50 years old.

Markings on glass shades say "made in Czechoslovakia"

Possibly converted oil lamps due to the knobs on the bulb fixings?

Any info would be appreciated!

Thanks