For details: (from Eastwatch Review)
http://www.eastwatchreview.com/blog/2015/12/7/a-historical-perspective-seagull-st5-antarctic
The watch was a wonderful gift from Joel Chan, when we first met, in Beijing in 2011. Joel is the owner of the very informative Micmicmor (Chinese) Vintage Watch blog. Joel was one of the earliest people--if not the earliest--to bring an organized look at the Chinese vintage watch world to the west.
Curator: Alberta Museum of Chinese Horology in Peace River; Member: China Horologe Association; Chief Expert: China Watch Overseas Working Committee (CWOWC); Sino-Canadian Horological Cultural Affairs...
I wore my ST5 yesterday. It is a good workhorse movement.
Great story, and a really handsome watch!