Help identify authenticity

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Hi,

I have found this constellation and I am taken back at the apparent quality and almost ONS bracelet and overall perfect condition of the watch.

The bracelet looks too good to be true and all the examples I have found do not have the beaded bracelet, is this original?

Everything else looks legitimate to me.

Can you please give comment on the bracelet overall and if this is indeed a good example and not to good to be true

I have identified this as a 168.018, however the markings on the case back look like 188.018 any idea on the date of this?

Currently low bidding so hopefully will go cheep.
Edited:
 
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Bracelet is authentic, I guess the reference in the clasp is 1503, 1037, 1068 or 8270, if there is one. Impossible to say if it’s “original to the watch” as the bracelet was just an option that the boutique would attach. Watch has been taken care of it seems, the replacement rotor and gasket point to a service at some point in its lifetime. Case _might_ have been rebrushed, I’m not deep enough into those to say for sure. Oh, and the second number of the reference will be a 6, not an 8. Otherwise it’d be an “electronic Chronograph”, not a “self winding center second”. Compare:

 
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It's 1966 according to the movement serial number. Very nice probably won't stay cheap.
 
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In my opinion is a nice watch and i also do not think it will stay cheap until the end. Good luck!
 
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Is that the way the bracelet should sit against the case?—it looks like it’s a weird angle with a big gap.

(This isn’t a pointed question: I genuinely don’t know what these are supposed to look like.)