Hello and congrats on venturing off from Omega and giving UG a chance!
Regarding your watch: the dial has been poorly redone. According to this configuration, this watch should be a 204612/1, but your case back says it is a /2, which corresponds to a black dial. This could be either because the whole watch is a franken or that the dial was changed by a repainted one at some point (it's likely the latter is true). The crown, gladly, is correct I believe; the 204612 series have these big crowns and, trust me, the crown alone is worth a couple hundred. All and all if you purchased this for less than $500 you couldn't expect it to be all original. You can enjoy it as is or find a correct dial for it.
I'm not the most knowledgeable about bracelets, but 90% sure it's not UG.
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