Hermann Riemann - Kerosene lamp - Metal - Bicycle carbide lamp

Vintage carbide (acetylene) lamp for a bicycle or historic vehicle.
Manufacturer: Hermann Riemann (a historic factory producing lamps and vehicle accessories, based in Chemnitz-Gablenz, Germany).
Model: “Detectiv” (with the factory mark and model designation No. 250 B visible on the mounting bracket).
Technical features: Made of metal (with its original metallic/nickel-plated finish and age patina), it consists of an upper water reservoir with a butterfly valve, a central calcium carbide chamber, and a front reflector with an original Riemann-marked glass lens. It also has an adjustable rear mount for attaching it to a bicycle’s handlebars or frame.
Period
Dating: Early 20th century (circa 1900–1920). This corresponds to the period when the German company Hermann Riemann was expanding production of bicycle and motorcycle headlights and lamps most rapidly, before and during the First World War. Item to be restored, untested, ideal for restoring a vintage bicycle.