Help Not sure if I have a real Omega watch

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Found this at Goodwill bins and feels pretty heavy has on the inside bracelet 10k gold overlay stainless steal. Looks legit but need to see if anyone knows what year and any info.
 
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Dates to mid-late1970s*. If it’s not working you might have problems getting it going as anything above just a new battery will be tricky and expensive. Try that first but take care. Parts are very very scarce.

*maybe F78 refers to the year.