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There are three easy ways to tell an authentic antique aerolux from the modern masonic light bulbs we sell. If you are looking for an antique aerolux on ebay, be very careful that you are not getting a modern bulb.
1) The base of the square and compass splits side to side whereas the modern bulb splits front to page.
2) Aerolux bulbs tend to have black writing on the bottom of the metal base that says aerolux or new york.
3) An aerolux bulb has many visible imperfections in the glass.
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