Georg Müller ‘Schwalbenlaterne'

D.R.G.M. stamped on burner plate side of globe guard (cage) = 'Deutsches Reiches Gebrauchs Musterschutz' meaning protected patented design. Notice the bird on the fount (the swallow) and on the globe.  All original and in excellent condition. 

This is a stunning and rare lantern.

 Circa 1908 - Berlin