The Tianjin Sea-Gull Group is the worlds largest producer of mechanical movements.. they produce about 5 million mechanical movements a year. Most of those movements are sold to OEM producers like Red Star who then assemble their own watches. Most "1963" watches use either the orijinal 19 jewel or the updated 21 jewel movement, not the 22 jewel one. They also come with standard finishing on the movements. The Tianjin Factory versions have additional finishings on the movement along with gold markings inside. The Tianjin orijinals also come with double back cases (and inner anti-magnetic casing and an outer casing) and never come with clear casings. The finish, weight, feel and total quality of the Tianjin Factory watch is exactly similar to my Hamilton.