Large, old, vintage ;oght bulb. May or may not work. Makes a great industrial type art object, sculpture. Measures 9 & 1/4 in. long, 4 & 1/4 in. wide, screw end is 1 & 1/4 in. wide. Glass top reads (faintly) WESTINGHOUSE. End is brass w/ cobalt glass. Neat inner center glass rod w/ twin metal filament fingers, jointed w/ thin wire. Has blackness inside in 1/3 of area. Rest of glass is clear & clearer than the scans (darkened for details).