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  Voltage- 220vWattage/rating- ? Filament- Carbon, Multiple looped, centre anchor Cap type- US Std base Circa- 1920s? Finish- Clear glass Origin- USA A real odd one- this very unusual carbon filament lamp features a quite unique filament construction that I have never seen anywhere else before. It is a 220 volt bulb and as a result it needs a longer length of filament than 110-120 volt ones. Normally this is achieved by having 3 or 4 loops side by side often with anchor pins at the bottom of each to steady them. This lamp however, follows the common 2-loop structure that many 110v GEM lamps use, but to accommodate the extra length of filament it has little extra loops at the top of the larger main ones. This may have been done to simplify its manufacture since it only needs one central anchor pin, and also can share the same stems as 110 volt lamps. It uses "dumet-wire" to pass through the stem (the same as still used today) not platinum links as found on most earlier carbons so it is a later use of carbon- by the time Dumet wire was commonly used, tungsten lamps were much more widespread.  I know absolutely nothing else about this lamp- its origin, era, purpose, etc- all a mystery to me. This is one I would definately like to hear about so please- if you know, or even just if you have seen them yourself, send me an email and let me know!
Shown here lit on 115 volts.
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