An early Royal Navy oil lamp, as can be seen in the photos this is very very dirty with age but is actually solid copper underneath the dirt but may have a silver/tinned type coating over the copper? We have been told that these are either for sliding inside the compass binnacle to illuminate the compass and also slide inside the Port and starboard copper lamps. Any info on this would be much appreciated. The lamp has no visible markings but if cleaned it may well show some up, the framework is slightly bent and out of shape with some knocks and the glass viewing hole has come partly un-soldered, both screw caps are in place and internally it looks good, both original thick wicks are in place, the rear adjustments feel solid but this is due to the wicks not having been moved for a long time. Although undated we had a couple of these the earliest dated 1880s the latest 1924 so presumably around these dates. Measurements are base width 4 ¾ inches base length to front of rear shield 4 inches, rear shield height 5 ½ inches height of burner pot not including wicks and wick housing 2 inches.