Help with identification

I would be so grateful for thoughts or advice. Whilst sorting through my late father’s effects I discovered this Longines watch. It seems to work perfectly despite being in a drawer for many years. The rear of the case has the engraving C G 1921-1946. There don’t appear to be any other markings. I am not knowledgeable about watches and have no idea of any provenance. I don’t remember my father ever wearing it. I’d be so interested to hear people’s thoughts. Apologies for the quality of the images, I’m not much of a photographer! I’m

Thanks for such a quick reply. Really not looking for a valuation, I don't think I'll be selling it it. I was really looking for information about the watch.

I'm not familiar with this early Longines models, but my guess is that the engraving is initials and service / member years of some individual. So they don't directly tell other from the watch than it most likely being manufactured in mid -40s.

It's a nice looking watch. Bracelet isn't original but that's a common thing. I would personally get it serviced by a reputable watchmaker and get a leather strap for it.

More precise manufacturing year can be known from a serial number engraved to watch movement (inside the watch, see attached photo). But unless familiar with watches I wouldn't try opening the watch and leave it to a watchmaker. But if/when a watchmaker services the watch you can ask them to take a photo from inside the watch for you.

Longines has a service (exctract from archives) to give additional info (where it's sold etc.) about the watch based on that meantioned serial number, but it costs around $150. So it's up to you to decide if that extra info is worth that price.

But like said you have a nice vintage Longines and if you get photos inside it please post them here. Always interesting to see old Longines.

Probably a ref. 4830 with a 12.68N movement

It looks like a 6B/159 watch issued by the MOD in England to the RAF during WW2 but missing the issue marks on the case back. Does it have fixed bars between the lugs

Thanks for the reply, that's really interesting. The bars do look to be fixed (to my non-expert eye). They are not the spring loaded bars I've seen on my own watches. I had wondered if this would cause issues fitting a new strap?

Yeah, normal straps doesn't fit. But you don't necessarily need to see a leather worker for custom made strap because there are this kind of straps available: