Antique glass doorknob with smooth round shape and flat face with a star interior. Standard size. This is the most typical type of glass doorknob used throughout history. All of our glass doorknobs are old salvage pieces, but age may range from 1900's to 1960s, Base finish colors may vary, if you have a preference, please let us know. Due to the fact that these are old salvaged pieces, there will be variation within types. The photo is simply a representation of an example. A matched set screw is available free of charge upon request. Price is per knob.