I'm no expert, but that case looks incredibly soft and well polished for being a "NOS" watch. Additionally where did the crud inside of the 8 come from if it is NOS?
This is one on ebay that also proclaims to be NOS, but it looks it to my eye - that case is sharp enough to shave with:
These examples seem to be far above where the market for Buren watches normally is. Like 10X over.
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