It's a brass Miller Monarch acetylene lamp, made in Birmingham. No patent numbers or dates. Lighthouse symbol on red and green side lenses. I've found no info after a thorough 'Net search. It must be 1890s to 1920s but I'd love to know the exact year range it was sold. Failing that, if someone has a catalogue page that shows it, please tell me the year. Finally, did brass lamps precede the silver coloured ones or were they sold concurrently? Please and thanks!