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<p>[QUOTE=&quot;Drew, post: 4525434, member: 3235&quot;]The base itself looks early and I&#039;ve seen several such bases with no switch . . . 1880-95. One would have to see it&#039;s internal parts to I.D.&nbsp; There were quite a few socket types and bulb fittings at this time - standardization came during the 1890&#039;s.&nbsp; During this formative period, Edison&#039;s DC (direct current) system dominated the market and his &quot;Bergmann&quot; socket was the prototypical design.</p><p>The first real challenge to Edison&#039;s hegemony came with the inauguration of Westinghouse&#039;s AC (alternating current) system in 1886. The Thompson-Houston Co., a supplier to Westinghouse, introduced the seminal socket for AC, which featured a distinctive cylindrical shell design.[/QUOTE]</p><p><br /></p>

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