On this page, you will find some other manufacturers of old Industrial Lightning

Viktoria Lampe

The brand Viktoria Lampe was mainly known for the banker's lamps/notary's lamps but has also made a workbench lamp which shows several similarities with the banker's lamps. Viktoria Lampe was a German manufacturer. Unfortunately, I have not been able to find any further information about this.

The one below had a workbench clamp, but it was broken. The recess in the shade is intended for a porcelain fitting with a switch; the arm is made of two flat profiles. Both features are also seen in the banker's lamps by Viktoria Lampe. There was also a lamp available with an oval foot. This model is probably from the 1930s.

RIJO

This lamp is not a workshop lamp, although it does have the same appearance. This is an architect's lamp designed by Marque Rijo. With black arms and hood, aluminum hinges, and table clamp. I have not been able to find any additional (reliable) information about this brand, presumably from Denmark.
I expect it to have been produced between 1960 and 1980.