I think this is brass or brass like metal. No stamps or hallmarks! The orange guilloche is in really good USED condition with 1 small area to note; see pencil pointing Its quite a thin pot… powder pot or snuff tin? Either way it’s very cute & I’m tempted to keep this! Size is approx 5.5cm diameter About 1.6mm thick in middle APPROx 167E Unusual Art Deco Orange Guilloche Enamel Brass? Round Vanity Snuff Box/Powder Tin