The arms are of the Swedish noble family, af Wirsén. It is one of the last armorial services which are recorded to have been made for the Swedish market and dates to the Qing dynasty, Jiaqing (1796-1820) period.
The decoration is in traditional Chinese "Famille rose" enamels. The Chinese name for these enamels are nowadays fencai but since this name does not seems to have come into use before the late 19th century it is questionably if that is the right term to use.
This decoration has been widely copied and the fakes heavily out numbers the real ones. It is possibly to identify the copies by a close comparison with the pictures here, since the copyists does not seems to be able to get the "dolphins" of the coat-of-arms right.