How do I decode these codes?
206 X4A1 14:57 and
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Those codes will typically indicate the production date and time of the product, not the expiration. Industry standard is to use Julian date codes.
For the information you provided:
'206' may correspond to July 25,
'V' and 'X4A1' shifts/production lines,
14:57 the finished sealed package stamping time.
Potato chips will usually be manufactured for consumption within 1 year, and longer and quality would decline due to the oils oxidizing and becoming rancid.