Thank you for your response, I have found out that it is a Mine Inspectors Safty Lantern, But the name "wolis Lamp" can not be found, The pat# is 302878.322514.453456.497699.509418,It is in great shape, I found one on Ebay that resembles it, also Made in Germany for $495.00 in very poor condition. There are a lot of Mine Inspector Safty Lamps out there, but only very few from Germany. I have not found out if "Wolis" changed name to "Willis". I will keep digging. Thanks for your help.