It's probably rolled gold and the 20 refers to the thickness of the gold - take it to your local jeweler to test. If you can provide me with your location I might be able direct you to a reputable jeweler in your area. Depending on your location.
Kind Regards
Yvonne
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Curious by: Brittany
So was it not real I have a similar one the has 20 on the inside on parts of the bangle
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Ross & B answer by: Antique Jewellery
Ross & B is the maker
1/20 refers to the rolled gold content (plating thickness)
