The Manchu were in many ways behind the times in technology, fielding large formations of archers long after Western nations had gone over completely to the musket, but they did adopt some firepower technology, such as the field gun. Pieces like these were used by the Manchu (Qing) Dynasty armies from its foundation in the seventeenth century, when the Chinese armies were still formidable and could successfully challenge Russian armies in the field, until as late as the Boxer Rebellion.
They were typical cannon barrels and carriages but the wheels were quite distinctive as represented on this model.
Available now, at the link below.
http://khurasanminiatures.tripod.com/ma ... inese.html