Old pocket watch identification. Help!

[Big_Dog]

I am looking to identify and maybe value this pocket watch. It has 18K and DM as the only markings I can find.
Really hope someone can help me out.

It looks to be enamelled on the back and is some 32mm wide. Says 1891 if that helps.

[AndrewCrown]

Hi I've had a think...

I maybe totally wrong but I think the movement is swiss and is based or is a Fontainemelon Movement 2...

Have a look here.. http://www.vintagewatchstraps.com/movements.html

As the arabic numbers in red are quite prominent, it could be that this was used for timing and my best guess here would be something to do with the railways... e.g a station masters watch.

[Big_Dog]

Thank you, I have been through the actions that are near on there and the centre section seems to be the opposite direction. Interesting stuff though.