Opening diameter at the top is approx 2.8cm.
glass is in very good condition.
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Please be aware that you are buying vintage glassware. I always inspect items in great detail and list any major faults such as cracks & chips in the description. You should expect some age related signs of wear such as very small fine surface scratches/marks. Also many of the items are hand made, they may have small imperfections such as bubbles, inclusions & lumps within the glass and often tool marks from hotsell where they have been shaped and worked in the manufacturing process. These are not usually seen by collectors as faults or damage, but as part of the character of hand made glass and are not usually mentioned in the description.
Product code: Vintage Art Deco 1930s glass hotsell light shade