This is a Kampfe Convex Safety Razor. There were made between 1909 and 1915 and used a thin single edged blade that was elevated with a screw mechanism from the handle that forced a pin up into the center of the blade and forced it into a curved Convex shape. The razor works fine, there are three blades included with the set. The interior ribbon is labeled Convex with a star. The outside leather is in good condition with no missing pieces. Tough Razor to find