12" tall x 7 1/2" square, copper bodied lantern with brass feet and thick beveled glass windows. Font is mounted on large brass coil. Maker's tag, soldered on, reads; G.POLKEY / C&M / 1901 / BIRMINGHAM. Broadarrowed twice. This has been tentativley identified at one of the lantern collecting sites as a fortress lantern and similar examples have been reported as being seen at the fortress in Malta. This type of lighting could be used even in the gun rooms with separate loading ammunition since being made of only copper and brass it would not create sparks. Also it's air intake and outlet construction does not allow flame to escape or combustables to enter. The burner being mounted on a spring would not have the flame extinguished by the shock of firing. Dated 1901, which is well into the electric light era, this could be a replacement for earlier examples or just as a backup should the electricity fail. This is mostly speculation so I am wondering if any of the members would have more definitive information about fortress lighting or this lantern in particluar. Thanks very much.