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Regarding the mystery of the OPs watch movement.
I think it's one of Omega sister brands, before the company adopted the Omega name. The company made at least a dozen other brands like Patria, Labrador, Decimal, Regina and possibly the one of most interest here, Gurzelen.
The OPs movement is, I am sure, a Gurzelen, possibly a Caliber 19'''.
The Brandt family were expanding rapidly toward the end of the 1800s and it's possible that a watch from the Gurzelen factory received an Omega dial to use old movement stock or to supply to a specific market. As so much time has passed, I can only offer suggestions.
Here is a pic of a Gurzelen movement almost identical to the OPs.
I think the movement in the OP's watch seems to be more closely matched to the FHF 18":
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It's not exact, but some of the details are a bit closer, such as the font of "Advance" and "Retard" as well as the visibility of the winding gear, and whatever the name for the spring is that goes around the large wheel gear.
http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&FHF_18
With all due respect, 'German silver' is a colloquialism for the nickel alloy Argentan (which contains no silver). This is a hallmarked silver case (albeit 800 not 925 - or even 935!).
The Gurzelen movement is also shown in Brandt company (La Gènèrale) advertising in 1907 and 1908, which is after the Omega brand was established and leads me to the conclusion I stated above.
Regarding the mystery of the OPs watch movement.
I think it's one of Omega sister brands, before the company adopted the Omega name. The company made at least a dozen other brands like Patria, Labrador, Decimal, Regina and possibly the one of most interest here, Gurzelen.
The OPs movement is, I am sure, a Gurzelen, possibly a Caliber 19'''.
The Brandt family were expanding rapidly toward the end of the 1800s and it's possible that a watch from the Gurzelen factory received an Omega dial to use old movement stock or to supply to a specific market. As so much time has passed, I can only offer suggestions.
Here is a pic of a Gurzelen movement almost identical to the OPs.
Sorry, I come late to the party (working too hard!). I refer only to the OP's first watch.
I think JiminOz has covered most of this. I have a few comments to offer.
What we know from the case is that it’s a 15-jewel lever escapement movement, with a compensated balance and Breguet balance (nice!).
The case number (641298) could be from within the Louis Brandt ‘group’ - and if so could date it at about 1890 - 1892 (impossible to be more accurate). But this is not an Omega product - so the dial must have been replaced at some time (as already mentioned).
An excellent spot by JiminOz, to pick up the Gurzelen from AJTT. As he himself said, many makers used this layout of finger bridges etc. However, what is particularly close (and unusual) is the location of the cover hinge (‘bottom left’ in the images) - please see the attached image for comparison. There are (many) differences - but at the same time, Gurzelen would have produced this movement over many years and no surprise that there were differences.