Dial has square trim but crystal is cushion shaped. The movement has the omega symbol indicating 1940 build date for the movement.
1942 Rosebud with a 1940 5AB movement. The dial may not be correct. However, one of the other Rosebud examples also has a similar dial/crystal mismatch.
In reply to 1942 Rosebud with a 1940 5AB… by Stinky_Sullivan
It appears the C in the serial number may be rotated 180°.
In reply to It appears the C in the… by Stinky_Sullivan
Stinky - that is not a "C", is a mis-stamped ZERO
In reply to 1942 Rosebud with a 1940 5AB… by Stinky_Sullivan
It's the Claire, not another Rosebud, that has a similar dial/crystal mismatch.
I thought that was a mis-stuck C as well at first but after looking in the DB I see there are other serial numbers that start with 0 so I would say it is a mis-stamped 0. I will change that for you. It would seem to be a Rosebud like this one https://mybulova.com/watches/1942-rosebud-13025 with a dial replacement.
1940 Bulova Rosebud
In reply to I thought that was a mis… by Kathy L.
After getting Kathy to verify that there are no other SN's with a C followed by 5 digits, I've concluded it is a mis struck 0.
In reply to After getting Kathy to… by Stinky_Sullivan
It's very common to see the first 0 in a case serial number mis-struck.
This does look like a Rosebud case but this model has a center line in the lug not shown in the other referenced watch or ad.
In reply to This does look like a… by JimDon5822
I agree. If you just consider the case, it looks like a 1940 Dolly Madison if I see the illustration correctly. But the DM had a 21 jewel movement. However, the dial in this watch looks like it's been replaced. If the original movement was replaced, dial and all, that could explain why it's not a 21 jewel and why the dial looks to be from a watch with a square crystal.
Having searched the entire site, I was unable to a match for your watch case. It is close to tje Roebud but not exact.
Based on how the watch is presented I would (at this stage) ID as non-conforming, based on the dial alone.
If we can find a matching advert we could look to ID based on the case, noting a dial (and possible movement) replacement.