Base type: E27. 1 x E27 Lamp holder as your choice. The portable E-27 screw-on bulb holder. They could assemble to a socket and cord for hardwired lighting with an exposed bulb for an early 1908s era feel.
Vintage Industrial Lamp Light Bulb Holder Antique Retro Edison E27 Lamp Fitting
E27 Vintage Industrial Lamp Light Bulb Holder Antique Retro Edison Lamp Fitting