I need help to identify a movement

Hello, Could somebody help me to identify this movement? and the approximate age? it is ealy 1900 I guess.

I searched but I only found one on this chinese website:

http://www.watchtimes.com.cn/article/1786.htm

google translate did not help.

The diameter is 40mm, an old pocket movement, there is no serial number on it. Thank you for all helps!

Hi, all Vacheron & Constantin movements have serial numbers
04/25/2016 - 00:09

If this recased watch really does not have a serial number, I doubt it is a VC.  

Is the watch yours?  If so, maybe you can inspect it again to search for a serial number.  

 

Re: Hi, all Vacheron & Constantin movements have serial numbers
04/25/2016 - 16:01

Hi, Thank you for the help! Yes it is mine. I must ask for reassembly. The number may be under one of the bridges, but I guess it wont be there.