Seems to be pre 1932 Victorian buttons, that were in use in Britain. I am not sure if the basic material is plastic or light metal.
About 1 inch diameter, in a good vintage condition. Look at the photos.
More information here: http://agoramarketplace.com/blog/basics-of-deciphering-hallmarking-on-your-antique-gold-jewelry/ "12K and 15K gold were widely used in Britain during the Victorian era, but these standards were discontinued in 1932 in favor of 14K gold."
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