Looks and sounds to me like it's a version of the Wolf Miners Safety Lamp as those patents are Carl Wolfs' they were made in Germany marketed in the U.K. here in the U.S. and elsewhere. Are you absolutely certain that says "Wolis" and not a disfigured "Wolfs"? On the other hand, there may have been other manufacturers that made lamps using Wolfs' patents too. I didn't find any mention of Wolis lamps even on sites devoted especially to miners lamps that I know of as I have a slight interest in miners carbide cap lamps.
Regards,
Willis
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