Where can you find a batch code?
It is often printed, stamped or etched on the bottom of a bottle or box, although the location and format vary by brand.
What can it tell you?
The code can identify a production lot for internal tracking and quality control, and some databases use it to estimate production timing.
Does it prove authenticity?
No. A convincing code does not guarantee authenticity because codes can be copied or imitated.
Should the bottle and box match?
Buyers often expect matching batch information, but marking practices can vary by brand and market, so this should not be your only test.
What matters more?
Buy from a trusted source and check the exact edition, size, packaging, receipt and return policy instead of relying on the code alone.
Related guides
A batch code is a tracking clue, not a final authenticity or expiry test.