What is a wine bottle datum?

"Wine bottle datum" is not a widely recognized or standard term in the wine industry or any other field.

It's possible that it's a term specific to a particular winery, retailer, or organization.

To understand what it means, you would need more context:

* Where did you encounter this term? Was it on a label, a website, in a document, or in conversation?

* What was the context? What was being discussed or described when the term was used?

With more information, I might be able to provide a better explanation of what "wine bottle datum" refers to.