This is a safety lamp manufactured by the Wolf Safety Lamp Company of America in the early 20th century. This lamp is one of the most popular Wolf designs, employing a glass enclosure, wire gauze on the top-interior, and a metal bonnet exterior to protect the flame. The "permissible" engraved on the lamp means the lamp was approved by the U.S. Bureau of Mines, and the lines on the glass portion suggest the lamp was used to judge methane levels. A plaque on the bottom reads: Wolf Safety lamp Co. of America, Inc. New York, USA. There is a plaque on the bottom of the lamp that reads: Mine Safety Appliance Co., Pittsburgh, USA.
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