Horological sleuths, need your opinion from this photo:

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The lug width on this Seamaster 120 is 19mm. Would you guess (or know) whether the buckle end is 16mm, or 18mm? Thanks.

 
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My gut says 16mm (an 18mm steel Omega buckle doesn't exist?).
I usually use a pixel ruler to solve this though but I am away from my computer.
Photopea works great.
Edited:
 
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My gut says 16mm (an 18mm steel Omega buckle doesn't exist?).
I usually use a pixel ruler to solve this though but I am away from my computer.
Photopea works great.

Agreed. From the era, I would say 16mm. But the picture makes me think larger. Hence the dilemma.
 
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Agreed. From the era, I would say 16mm. But the picture makes me think larger. Hence the dilemma.
Right.
I measured it with the pixel ruler and it shows around 14mm, which can't be right. There might be some parallax so the pixel ruler is not very useful.
Very low chance it's 18 I think!
 
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Right.
I measured it with the pixel ruler and it shows around 14mm, which can't be right. There might be some parallax so the pixel ruler is not very useful.
Very low chance it's 18 I think!

Many thanks.