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Thanks, Stan.
I am not a member of Invaluable, so while I was able to view the photos and description, I do not know what the estimate is or what auction house.
I did notice the photo that shows the inner core of each cong. From my short investigation into Liangzhu congs measuring this size (9.5"), there should be a center ridge from where the hole was bored out from both ends of the cong as a result of the typical misalignment of the primitive drilling methods used at that time.
No such ridge can be seen in the photos. Even if additional tooling took place to remove the ridge, the hole would not be so perfectly cylindrical and aligned.
So, either the carver was very lucky and perfectly aligned the hole cutting tool on both congs, or this pair is a later copy.
Just my opinion.
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