Beijing 北京 Yanshan 燕山 20J (Mount of Swallows)

Model : Yanshan 燕山 20J
Manufacturer : Beijing 2nd Watch Factory
Year of Production: 
Case Diameter : 
Weight w/o strap: g 
Movement Model : Standard Movement ( 20 jewels) 
Type : Hand Wind

Yanshan, a watch by Beijing 2nd Watch Factory. Yanshan literally means mountains of swallows 燕. In fact, Yan Mountains are the major mountain range at the north of North China Plain. Speaking of which, I should also mention that Taihang Mountains are at the west of the plain and I have a watch named after it (The link is here). Genghis Khan entered into China via this Yan Mountains to attack Beijing which was the capital of Jin Dynasty at more than 800 years ago.

The logo is, I think, a flying swallow with both wings wide open The same is engraved on the caseback surrounded with the words "Yan Shan", "Quan Gang" (all stainless steel) and "Fang zhen" (anti shock).

It is powered by a 20 jewels standard movement and other than the "20 jewels" inscription on the bridge board, there is no code on the movement. It could be a 1980s products. 

More shots are here:
The Movement
The Movement and the Caseback