How to read a La Mer batch code
La Mer belongs to the Estée Lauder Companies group, which prints a short 3-character code, usually on the bottom of the product or the box:
- 1st character: the factory (plant) code
- 2nd character: the month (1–9 = Jan–Sep, A = Oct, B = Nov, C = Dec)
- 3rd character: the last digit of the manufacturing year
For example, A73 decodes as shown when you enter it above. Because only one year digit is stored, a product made ten years earlier shares the same code. That is why we show both possibilities.
Frequently asked questions
How do I read a La Mer batch code?
La Mer (Estée Lauder Companies) uses a 3-character code such as "A73". The first character is the plant, the second is the month (1–9, then A = October, B = November, C = December) and the third is the last digit of the year.
Where is the batch code on cosmetics?
Usually it is a short code stamped or embossed on the bottom of the product or printed on the crimp of a tube, often near the barcode on the outer box. It is different from the barcode.
What does the open-jar symbol (e.g. 12M) mean?
That is the PAO, or Period After Opening. It is the number of months a product stays good once opened, regardless of when it was made.
Do cosmetics really expire?
Yes. Preservatives weaken over time and actives such as vitamin C, retinol and sunscreen filters lose strength. Expired products can irritate skin, harbour bacteria (especially mascara) or simply stop working.
Batch-code formats are based on publicly documented manufacturer conventions and can change. If in doubt, contact the brand with your code. Shelf-life figures are industry averages.