40's Omega Art Deco big-size manual winding

Hi all, and thank you for the help I have recieved over the last few months with a couple of questions I have had.

Today I discovered this and it has an appeal to me, however I have questions. Firstly, images.

The watch (45mm?):

The caseback:

The movement:


Doing a little research the Omega type could be correct for the period, I searched Art Deco on the forum and a few sales examples had that typography.

Everything else I am finding it hard to decipher. The movement has no markings, which having looked around can happen (unless I am very wrong?).

The size would indicate that if correct it maybe a converted pocket watch? I can also see that the hands are different shades and possibly the minute hand has been changed.

I suppose the question is. Is this just a big freak/franken watch that isn't even an Omega?

Which was my assumption.

In this scenerio would the face and movement have simply been placed into a wristwatch case, or are they 2 seperate pieces that have been placed together, or impossible to tell?

That was also in the title for the sale post, which now makes a lot of sense. Thank you for the education.

The CK2039, my pockets aren't deep enough, but exactly what I am looking for.