Pocket watch chronograph, what have I got?

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Received this in today and took some images of the movement.
The PW has no identifying manufacturers names at all.
Does anyone recognize what the movement is and who the manufacturer might be.
The case is either gunmetal or blued steel ( same thing?).
It runs beautifully and is fully functional but in need of a service as it's running some what fast.

 
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Nice one G, I don't know maker/caliber and there were so many of them that all looked similar. It looks a bit "Landeronish", but could be anything.

Case is blued steel. Gunmetal would not show rust (non-ferrous).