Metal - probably tin - with a mellow yellow to copper color tinge to it. The lamp has three sides with thick, heavy panels of bevel glass. Raised domed top. The hinged door has holes pierced on the bottom for venting. Round reflector behind the candle to throw light from the flame. Has a sliding latch and ring on the top for hanging or carrying.
Measures 9 3/4 inches tall by 5 1/3 inches wide by 3 3/4 inch deep. Everything is intact and all the mechanicals function. The finish is worn and showing through a fine rust or copper color - please enlarge photos - in no way detracts from the lantern's appearance, actually enhances it. It's difficult to measure the thickness of the glass, but it is approximately 1/2 inch thick and is beautiful. Overall very good condition.