Antique Aladdin Nu-Type Model B Oil Lamp was made in Chicago, USA. The metal base has a matte grayish black patina. I have not been able to remove the cap. Top part of burner removes easily. Hard to turn the knob.No dents in the metal. Base to top of burner is almost 12 inches. Base to top of chimney 23 1/4 inches. Twist and lock chimney in very good condition. Overall good condition on the lamp.