This is a vintage, Chinese, 1930's relatively large size lidded box in brass with raised and guilloche enamel decoration. The phrase 'museum quality' is a marketing term used by art framers. Technically, items are not 'museum quality' nor is framing in general. These enamel lidded boxes were common export items in that era. The image of the buildings are likely stylized versions of the architecture at the Summer Palace outside of Beijing. These boxes in sterling or 800 silver tend to sell for higher than ones done in brass metal. Most were produced in a 'stamp box' size, whereas this is approximately 3x the size of a stamp box.