Early 1900s wristwatch movement ID help... Elgin, Waltham, Swiss???

trying to id this movement.
Circa 1914 maybe earlier maybe later
It is a private label watch - the name is blocked out so as not to waste anyone's time looking them up.
I have tried for months on line and all there is is a 1913 and a 1914 newspaper ad.

Hi Roddy. Looks Swiss to me. Maybe Longines?

Hi Roddy and Marc: I suggest you check out site "Vintage Watch Straps" run by David Boettcher. Go to his site and click on tab "Tech" and then "Movement Identification". In that section you will find an early Omega that appears to me to be like yours. It also has a picture of the keyless work which would be the defining moment. Good luck with it and if possible I would like to see a picture of the Keyless Works. John

Thanks Marc.

Thanks John.
That was the first place I looked but I didn't find it the first time. I can't believe I missed it before.
A pic of the keyless works would be difficult as that would require removal from the case & removing the hands. My clumsy fingers & delicate watch hands do not get along. I don't want to risk ruining a 105 yr old working watch.
Rod

You are welcome Roddy. I might add I have sent pictures to David before re. other movements and he has graciously replied and usually with information on the movement. He is a pretty busy guy and it may take awhile but it is usually worthwile to ask his opinion. Let us know if you nail it down. John

Hi John,
I'm guessing the only way to absolutely 'nail it down' is to remove the dial. I won't be attempting that. If there were no hands, I would.
I have emailed David once before and found him to be very helpful.
Rod

Really the only sure way to identify movement is by examining the setting parts, what we in the watch parts business call "fingerprinting". I would go with Longines as the fishscale or spotted finish is fairly typical. Swiss movement origin can be tricky to identify if made before WWII.

Thanks Wiliam,
I guess I'll have to take to a watchmaker to get at the 'fingerprints'. No sense in me taking the chance of wrecking the original hands.
I just posted a similar query on a Circa 1922 Safety Barrel movement...

Roddy, to me it looks like a Swiss Cyma/Tavannes movement. I have seen a few in trench style watches and this one has a train bridge like Cyma.

Best way to ID is under the dial. The train bridge is not reliable. It looks like an Elgin or a hundred other train bridges. Much of what we do in the watch material business is identifying movements. ID by setting parts is still the surest way. That "fingerprinting" method goes back to the 1890s.

Okay, I'll try to get the hands & dial off without wrecking the hands. It may be a week or so before I can do that. Afterwards, I'll have to take the watch in to have them reinstalled.

I am almost ready to touch/remove the hands...