Help Required With Case Markings

Hi Everyone!

I’ve just registered but I have been scouring these boards for information for a while, trying to find some information about a new but old purchase; but let me start with a bit of an introduction first:

I’m a mechanically biased engineer living and working in the UK. Obviously I am a fan of omega and do keep feeding my obsession which started back in 2011 with a Diver 300M (just before they moved to the plain dial over the ‘wavy’ one). Since then the stable has grown and I keep adding a new modular element to my watch winder set up.

I’ve always been interested in Pocket watches and was recently in a position to purchased one from a well known auction site. I have been (rather Obsessively) trying to decode the various marks etc on the movement and case but I’ve hit a stumbling block so thought I’d turn to the collective wisdom of the forum and ask you all.

This is an image of the offending marks

Further details:
Movement Serial Number: 5396333 (which I believe dates it between 1915 and 1923) oh and it is a ‘C’ Grade movement.
Case Serial Number: 6045069 (which I believe dates it between 1918 and 1923)
The case is marked with the Grouse denoting 0.800 silver but also has the assay mark for Germany though this was stamped with a G below which I understand means it was assayed in Geneva.
I have the original (I believe) box from the Wartchmaker and seller in Stockholm.

I’ll post other pictures when I get a chance. It still keeps perfect time and is actually as accurate (or slightly more so) as my Seamaster Diver 300m

Thanks for looking ans feel free to ask me any questions - I’m still finding my feet here!

Sorry - for some reason in my last post the image did not appear - the photograph above shows a series of 3 lines of text lightly scribed into the silver - these are what I’m struggling to track down.

Oh that is brilliant - there are 4 such markings that I can spot so at some point this was regularly serviced. I had no idea what they were - this is great thanks!

Hi everyone, I’m back with more questions, but first I realise I never showed any full images of the front and back of my watch

So my new questions are around the medal motif on the inside of the case and also concern the regulator.

I understand that the 6 medal design used up-to around 1910 was from an award received at the Paris expo, I can’t seem to find out anything about the 12 medal design on my watch - or even what each of the medals are/are for.

Also, I have managed to find out that the regulator on my watch is a “star regulator” and that is pretty much all the information I have. If anyone can shed some light on this aspect of the movement for me then it would be wonderful.

Thanks in advance again folks!