VTG Antique Entry Door Lock Set Brass Glass Knob Mortise Deco Russwin Deadbolt
Deadbolt works by turning the inside small knob. Key included, fits the lock but will not turn it, however lock works fine by using the inside door small knob. (yes, wrong key, but new owner can take to locksmith to correct this). Not an expert on locks, but do ask any questions and I will do my best to provide an accurate answer.