An original Ship Lantern, 1940 Alderson & Gyde Ltd 1940 Bow Starboard PATT. 24. this is all copper and Brass and weighs 15 lb.  It has a Fresnel lens in great condition marked 1940 CB on the front.  It has 2 mirrors one on the inside and one mounted to the double burner.  The blue glass filter is perfect and slides in on a rail.  the burner seems to work fine.  The is a great looking lantern all original. original WWII period lantern.