Hi Bob,
Two or three years ago I brought an 1888 Swan bulb w/base socket to the Antique Roadshow when they came to Providence RI. The appraisor there said it could be worth upwards of $100.00! I figured he didn't know what he was talking about and haven't watched the show much since. Where were they when the bulb got appraised? The Antique Roadshow is repeated alot around here and I would like to try and catch it. Thanks, Tim