Omega Seamaster 166.037 SP Authenticity Check

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What do you think yourself?
 
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I think the caseback looks off. But the front seems legit. Its of corse not in a good state but i serviced a 564 before and understand the Movement. It would be a repair piece for me.
 
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I don't like the engraving on the caseback at all. I'm also not keen on the date changing at 8.20 as already noted. I would leave well alone, in fact I'd run away.
 
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Fakes of that vintage are usually pretty ugly dials. i'm going to go with 'real but in rough shape'. Its a watchmaker's-special (for the right price, I'd go for it). The caseback engraving doesn't match the rest of the case condition, so something goofy is going there.

To ME, as someone who would get it to work on (and figure that a service/repair parts would be more than its value anyway, so no money to be made) it would depend on the price.

I'd need to see evidence of life (either a good photo of the hairspring/complete movement photo, or some evidence that it is running not awful) to spend more than ~$250-300, and even then, probably not much more.

Hand/date position wouldn't worry me, that likely means the last watchmaker messed it up, or the hands slipped (much less likely!). Either way, I'd not be horribly concerned with that, as a project.
 
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Watch is genuine, bracelet is after market.
Dial has a bad case of bubble corrosion, movement will need work.

Unless it's cheap I'd walk away.
 
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I can’t see any reason to buy it as a watch to wear.

There are plenty of nicer watches out there at sensible prices.
 
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It’s perfectly legit but that should only be half the question. Condition is poor and these mid 60’s Seamasters aren’t hard to find in good condition so it’s an easy pass for me.
 
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Jan is a hobby watchmaker I'd gather, so like me, our requirements for watches are different. Watches that many of you would give up on as not good enough condition (particularly if I'm not bored of the movement kind yet!) are entertaining in their own way. I bought a bumper that someone brought here for a bit over $300 despite a redial, so that I could have a 'complete' watch to play with/get to service.

IMO, I would buy this watch for the low-few-hundreds, and spend a few hours cleaning it up, maybe buying a new crystal, and having a good time and end up with a half-decent watch I can sell cheap or give away.

Here's my collection of watches (other than top right!) that are exactly this case for me! Each arrived in some state of disrepair/ugliness, and some still have marks on the dial that make them less than awesome. That said, its a fun collection (though, I don't wear them, I still am neurotic about wearing watches I repair, even though I force myself sometimes)!

 
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Thank you Erich!
You unterstood my Plan! Has anyone seen such a caseback before? I have a 562 in parts already at home so the only thing thats concerning me is that caseback.
Thanks for all the comments so far!

Greetings
 
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Caseback looks in very good shape compared to the rest of the watch, so maybe that is what makes you wonder. But generally it looks fine to me
 
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Ok i think i found the reference
166.037 SP
I also found other models with exactly the Same caseback!