The bracelet, if it is an Omega BOR, is worth a significant amount of the total value there.
Honestly is the best policy, so here it goes. The Seamaster 30 is an abundant but reliable and quite affordable model, and yours is negatively affected by the relatively amateurish engraving on the back.
If an engraving was a professionally done monogram, or neatly scripted name, or had some historic significance to the broader public, it might not hurt the value too much. But that looks like it was done by somebody who didn't know what they were doing.
To summarize:
The good - the bracelet (if it's Omega), the dial condition, and the case sharpness.
The bad - the non-original crown.
The ugly - the case back engraving.
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