Old Omega Identification | Help Required

Hello There 😀

I have been offered an old Omega to purchase from an acquaintance. From what I have searched on an online serial number check, it does seem to check out. But I need more help and here is what I need help with:

1) I need to know if this is genuine or not as I'm new to collecting watches and I need all the help I can get to identify this watch for me. For your reference, the number on the inner case back is 4918338 and on the movement, 4909159. I understand that some Omega's have mismatched case numbers and movements but the difference should not be too much between them.
I have also noticed that the outer caseback is very smooth with no marking at all. I'd like to assume that this was the case back in 1912.

2) This watch was purchased new and has then been purchased by the acquaintance from the buyer when he grew old. The acquaintance has used it for a while and has now offered it to me for sale. I tried to find more information on vintage Omega's with crowns as big as this one but could not find anything.

3) As per the serial number check, this seems to have been manufactured in 1912. I need to know if this watch really does come from that year (or approx. +/- 2years) and whether the hands and other visible parts are genuine of the watch. Any more info on the model, year and a valuation would be greatly appreciated 😀

4) Lastly, I am considering purchasing this watch. I almost made a deal but managed to hold off a bit as I realised I needed to stop myself from making an impulse purchase.

I appreciate all the help I can get and thank you for your advice on this 😀
Gavin

The serial to date lists aren't correct for that far back. That movement is likely newer. The case looks like a conversion. Nothing wrong with that, necessarily. A lot of pocket watches were converted to wristwatches. That crystal is totally inapporopriate, but not unusual. A lot of watchmakers will fit what they have, not what they should. The hands don't really match the dial that well.

If that were offered for sale here in the US, knowing my watchmakers, I would consider that I would have to get the crystal and hands replaced, and the movement serviced. I can deal with the case as-is. I would pay no more than maybe $250; you'll have to ask your countrymen what that means for your local market.

It's OK. It could be better. It might be fun after it were taken care of.