Pubu 瀑布 (waterfall) brand watches were manufactured in Guiyang, probably by Guiyang Watch Factory. Full size models, like this one, are very difficult to find. Considering the close relationship between Guiyang and Chongqing Clock and Watch Company, it isn't surprising that this example has a ZCQ movement. Its date code, 8510, suggests that the movement was manufactured in October 1985.