What does the batch code on a whisky bottle mean?

A batch code is the designation by which a bottler identifies the lot of bottles that was filled under virtually identical conditions.

The law calls that a lot: a collection of sales units of a foodstuff that has been produced, manufactured or packed under virtually identical circumstances. The one who delimits that lot is the producer, the manufacturer or the packer, or otherwise the first seller within the European Union. The code is therefore not a quality mark and not a quality judgement, but an administrative trail: it makes it possible to trace one filling among all the others.

Legally required is a statement that makes it possible to identify the batch to which the bottle belongs, and nothing more than that.

That requirement is set out in Directive 2011/91/EU of 13 December 2011 and has been elaborated in the Netherlands in article 4 of the Warenwetbesluit informatie levensmiddelen. The statement is preceded by the letter L, except when it is clearly distinguishable from the other statements on the label. How the code looks beyond that, the regulation leaves open. There is no prescribed length, no prescribed structure and no central register in which you can look up a code.

Voluntary is the batch indication that a bottler puts on the front label themselves, for example a number in a series of bottlings.

No rule makes that designation mandatory, and it does not have to match the legal lot indication elsewhere on the bottle. The Scotch Whisky Regulations 2009 do require the category to appear on the front, Scotch to have at least 40% alcohol and to mature for at least three years, and they regulate how an age or a distillation year may be stated. They say nothing about a batch designation. A bottler may therefore number continuously, start over each year or not put a number at all.

The law prescribes no fixed place: the statement may appear on the prepackaging, on a label attached to it or on the packaging itself.

In practice, you therefore come across the code in widely varying places. Printed small at the bottom of the back label, with laser or ink on the glass of the neck or shoulder, on the base of the bottle, on the capsule, or only on the tube. If it is on the glass, it is often poorly legible and you have to hold the bottle up to the light. If you see nothing on the back label, first look at the glass before assuming there is no code.

From a batch code you can tell that a number of bottles belong together, not when they were bottled or how long they stay good.

A batch statement is not a bottling date and not a best-before date. Because every company chooses its own coding, the same letter or number sequence means something different at one brand than at another. So do not read a date, a cask number or a print run into it. If you want to know what a code indicates at a particular brand, the bottler is the only reliable source. Some companies explain their system, others keep it to themselves.

With cask strength bottlings the batch code does most of the work, because each filling there is a batch of its own with its own alcohol percentage.

Two bottles with the same label but a different code come from two separate fillings. According to Regulation (EU) No 1169/2011, the actual alcoholic strength by volume must appear on the label, so you can usually tell that difference between two batches straight away. For such a bottle, note the code next to your own notes, so that on your next purchase you know which filling you had at home before.