Hot Wheels Base Codes: Decode Any Date Code in 10 Seconds
July 14, 2026 · Updated August 3, 2026
Flip over any modern Hot Wheels and you will find a short stamped code: a letter followed by two digits, like T07 or M42. That is the base code, and it tells you exactly when your car was manufactured, down to the week.
Decode yours right here, then read on for how the system works.
How the base code system works
Since 2008, Mattel has stamped a date code into the base of every Hot Wheels car:
- The letter is the year. A meant 2008, and the alphabet has marched forward one letter per year since, skipping I and O because they read like 1 and 0.
- The two digits are the week of that year, from 01 to 52 (occasionally 53).
So T07 decodes as week 7 of 2025, a car that came off the line in mid-February 2025. M42 is week 42 of 2019, late October.
The full letter-to-year table
| Code | Year | Code | Year | |
|---|---|---|---|---|
| A | 2008 | M | 2019 | |
| B | 2009 | N | 2020 | |
| C | 2010 | P | 2021 | |
| D | 2011 | Q | 2022 | |
| E | 2012 | R | 2023 | |
| F | 2013 | S | 2024 | |
| G | 2014 | T | 2025 | |
| H | 2015 | U | 2026 | |
| J | 2016 | V | 2027 | |
| K | 2017 | |||
| L | 2018 |
Cars on pegs right now mostly carry U codes (2026), with late T codes (2025) still flowing through as older case stock sells down.
Why collectors actually care
A date stamp sounds like trivia until you hit the situations where it decides things:
Production year vs release year. A “2026 mainline” car can carry a late-2025 base code, because production runs ahead of the retail year. The base code tells you what the card cannot: when this individual unit was made.
First runs vs reruns. Popular castings get produced in multiple waves, sometimes with subtle differences (shade of paint, wheel variations, base material changes). The base code is how variant collectors separate an early run from a later one, and it is often the only evidence.
Sanity-checking a listing. A seller’s “original first release” claim is checkable in three seconds if photos show the base. A base code from two years after the release year tells its own story.
Loose car forensics. For an unpackaged car, the base is the identity card: the toy number tells you which release it is, and the base code tells you when your specific copy was made.
What the base code will not tell you
It will not tell you rarity: Treasure Hunts and Supers are identified by their graphics, paint, and tires, not by base codes. It will not tell you the release’s year on its own (that is the toy number’s job, via a catalog). And cars made before 2008 predate the system entirely; dating those relies on copyright years and casting details, which is a deeper hobby of its own.
Put the whole base to work
The base code is one of three data points on the base worth recording: code, toy number, and country of manufacture. When you scan a package with Hunt64, the toy number does the identification against a 10,000+ release catalog (year, series, rarity flags, community prices), and the notes field is the natural home for the base code of your specific copy, especially for the carded keepers where production week can matter someday.
Bookmark this page for the next time you are squinting at a base in a store aisle. Or just remember: letter is the year, digits are the week, and the alphabet started at A in 2008.