The dial is in very good condition, and the crystal gasket (which are normally a reddish brown color) has been replaced with a new one, so at some point someone knew what they were doing. Which is no small feat given that these watches are notoriously difficult to open with the pressure fitted casebacks and two piece stems. Now, that said...
The case has been heavily modified. It likely was one of the models with an integrated bracelet (for an example see
https://www.wristmenwatches.com/cn/vintage-omega-seamaster-cosmic-2000-automatic-swiss-wristwatch-2), which at some point was damaged and instead of finding a replacement bracelet, the "lugs" were cut wider and new lug holes were drilled to make the case accept a conventional bracelet or strap. There were other models out there that didn't take integrated bracelets, but they had different case shapes and this isn't one of them. So in short, there isn't a proper bracelet for this out there because it's been modified from OEM.
Now, the good news is that these cases are modular - meaning that if you press down on the crystal and bezel and hold the edges of the lugs in place, the watch "head" itself will pop out of the bottom as it is only held into the case/ lug assembly with friction from an O ring gasket seated in a recess. As I said the dial is in great shape, and if you were to source a new case/ lug assembly from a donor watch on ebay (which are not uncommon), you could conceivably pop your watch head into a decent case/ lug assembly, which would solve your bracelet and potentially the brushed case finish issues all in a single stroke.
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