Why did this Omega fetch $2200 in auction?

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There were 3 bidders too, which made me think it's special in a way I don't know

 
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It's a 30T2Rg Chronometre, but with a refinished dial.

They were produced in two sizes, and I would guess that one to be the larger (~35.5mm).

OMchronMod3.jpg
 
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This is what the original looks like 2366, cal 30T2Rg, 35,5mm