Identification/authenticity check, 50s cal. 283!

Hi there!

New member here - this is my first post.

I recently acquired a beautiful 50s (possibility late 40s?) Omega with what I assume to be cal. 283. The watch is in almost perfect condition, apart from a few scratches on the case. The crown and glass have been replaced, as far as I can tell. So far I have come across very little information about this model, so I'm hoping I might have some more luck here.

I have not yet "popped" the case, as it seems quite stuck and I don't want to scratch it, so unfortunately I don't have the reference or serial number. Any pros in there who can guess approx. reference number and/or year of production based on the photos?

I'm also curious as to whether the dial is original or a repaint. Seems almost too good to be true, considering its age, doesn't it? On the other hand, the patina looks about right, and if the indices and hands have been refurbished, it's a pretty good job.

Will update if/when I get the case open.

Any thoughts?

As mentioned. Reference number on the inside caseback. With that you can Google search and see what a dial should look like. Gold hands could be original. Sweep hand looks like a replacement.

crown no original, but not a major thing to worry about