Identification help. Great grandfathers pocket watch

Hey everyone! New guy here.

I'm not a watch guy, but my father just handed me this vintage Omega watch and I'd like to know more about it.

A bit of backstory; my great grandfather supposedly walked 120km to buy this watch, but they didnt have the model with numbers instead of roman numerals at that store, so he walked another 100km to the next one to get it.
My father didnt know when this took place, but I assume it was during the interwar years although I'm not certain.
My dad was told this was the first Omega pocketwatch with numbers on it, though after googling a bit I found models with numbers all the way back to 1902. Then again these could have a upgraded face I suppose?

I tried researching this myself, but unfortunately I could not find an exact match so now I'm here asking the Omega gods.
I did find models with very simelar faces, but with slight differences in number placements or details.

The casing is non magnetic, so I'm assuming it's silver.
It's got some wear and dents, but it still runs perfectly fine!

Thanks for any assistance you can provide!

I did take a look at the posting guide, but as it doesnt have any engraving or other details I did not post these images. But here they are!

I didnt see this before, but the number 28884 is also etched upside down below the serialnumber.

As for additional information about when it was last serviced I would say not in the last 40-50 years. Can't even begin to guesstimate anything before that.

And it looks like the chain is in a different material and possibly newer, so it's likely not original.

Hope this is sufficient.

This being said, I will not open it myself and I will eventually take it to the closest Omega dealer for service as I would like to use it for my formal wear. I

I hope bumping is allowed. If not, I apologize.