Older Chinese enameled articulated fish. It is 1 7/8" long, not including the jump ring. The enamel is in shades of blue and is in excellent condition, with minor crazing visible under magnification.
The fish acid tests as 800 or more silver. The design and history indicate that this fish dates from approximately 1925 - 1930. We often have newer articulated fish. When the newer and older are viewed side by side, the higher quality of the older piece is evident!