Although the lighter looks black it is, in fact, silver that is heavily tarnished. It is a Unique and probably dates to the 1920s. The original tarnish is in place and the condition looks good to my untrained eye. The lighter is Made in Switzerland and has US and English patents.
All seems to be in working order but lacking a flint. Im not sure if the top of the snuffer is correct. Looks like a visible screw on top. Maybe the top has been replaced?
No dents or dings but several light scratches are visible particularly on the bottom. I have left the lighter as found. The item "Dunhill Unique Sport Cigarette Lighter Silver Plated Swiss Made 1920s" is in sale since Friday, February 21, 2020. This item is in the category "Collectibles\Tobacciana\Lighters\Dunhill".
The seller is "nycpens" and is located in Highmount, New York. This item can be shipped to United States, Canada, United Kingdom, Germany, Japan, France, Australia.