Omega De Ville 151.0039 movement

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Hi 馃憢 hope you're all doing well.

I'm looking for some help (and potentially reassurance 馃檹) on a recent vintage Omega purchase.

My Dad (as am I) is a huge watch enthusiast, but largely has stayed in the realm of Seiko, Hamilton, Timex, etc until now.
Omega is his top-tier watch brand - so for his 60th birthday, I wanted to go the extra mile & pick up a birth year Omega for him.

Came across a De Ville, 151.0039, with a movement serial circa 1966 - that was within budget.
Reputable professional seller on Chrono24 (4.9/5), 150+ sales, responsive to questions, no red flags raised & no indication of any "funny business".

Once the watch is in transit, I realise the listing/photos indicate a calibre 712 (not the 711 commonly associated with this De Ville reference).
Admittedly the watch was described as having a 712 calibre - I just didn't catch it right away.
The serial range (I don't have the full serial from the photos) still checks out as a 1966 - there's a couple of listings online that mention 712's, but far far less than 711's.

My understanding is 712 is essentially the chronometer rated version of a 711 - so arguable a better movement?
But now I'm doubting myself entirely 馃槗


I don't want to share photos/listing just yet, as I have yet to receive the watch myself still.

Seller has tried to reassure me that, this is not uncommon for a watch of this age.

But what is the most likely scenario here?
  • Some mid-60's production inconsistency? Leaving the factory with a 712?
  • A later movement replacement, with a compatible calibre?
  • Something to be more suspect of?

What is the general consensus on this?

Maybe another important note is that the crystal & crown are non-original. Crown maybe less common to have been replaced, but crystal I'd imagine is normal after 60 years.
The watch looks like it's lived a full life - it doesn't look obviously fake or anything.

Thoughts? Is it something that raises enough red flags that I should return it?
Or is it on-par for a mid-60's reference, that has been used/loved/scratched/serviced/etc?
 
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Welcome to OF @abire

It shouldn`t be a chrisis to have a chronometer rated movement, but I think most people on here are waiting for the pictures.
 
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Again, just to be clear - I have no solid reasons to believe anything untoward here.
Seller has been very accommodating & well rated etc.

I'm more just curious as to what the history of such a piece could be? And if it's anything to concerned by?

I've lurked around a bit online & there are stories of movements in watches that are not quite what you'd expect. But oftentimes it's put down to service history, or production/release variations early in Omega's history.
 
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This is really a photography forum disguised as a watch forum.

(I also collect cameras. and film processing equipment.)