Looking at buying this 1956(?) Seamaster. Need advice

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Cal 267, Ref 2891-3.
Is $705 a fair price?
Does anything scream redial/fake?
 
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What are your thoughts on it?
Have you compared other examples of the same reference?
 
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What are your thoughts on it?
Have you compared other examples of the same reference?
I definitely don't have a trained eye, but from what I can tell most others I've seen either use Arabic numerals on the 3/9/12, or don't have the crosshair dial. They all look like features on real Omegas, but I can't find another example of this specific configuration.