Here's the cast and crew list. I get the impression that the films in the late 1940s may have been made in Hong Kong, rather than in Shanghai.
Hero of Our Time (1948)
一代枭雄 (1948)
http://www.mtime.com/movie/47754/
Production Company:
许立斋 Xu Production Studio
Producer: 毕虎 Hu Bi
Director: 毕虎 Hu Bi
Screenwriter : 毕虎 Hu Bi
Principal actors
白燕 Yan Bai — 陈美娜 Meina
徐莘园 Ziyuan Xu — 陈查礼Charlie Chan
吕玉堃 Yukun Lu — 金百川 The Rivers
王斑 Ban Wang — 探长Detective
姜明 Ming Jiang — 吴怀德 Tunfude
鹭红 Lu Hung — 董丽珠 Donglizhu
殷秀岑 Xiucen Yin
尤光照 Guangzhao You
周文彬 Wenbing Zhou
高第安 High Resolution
廖凡 Fan Liao