Type in the code from the bottom of the back of a Topps card, the one that looks like CODE#CMP138752. The last three or four digits are enough. You’ll see which set and which part of the set the card is from, with the full card list.
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What is a CMP code?
Modern cards made by Topps (Topps, Topps Chrome, Bowman and the rest) print a small code on the back that starts with CMP, followed by a string of digits. It tracks the print run a card came from. Different parts of the same product are printed separately, so they get different codes. So the code can tell apart cards whose fronts look almost the same, such as a base card and its short-printed image variation.
One code can cover more than one part of a set, so the lookup lists everything a code is known to cover.
Where to find it on the card
Flip the card over and look along the bottom edge, in the small print with the copyright and licensing lines. You’re looking for CODE#CMP followed by digits. The print is tiny, so zooming in with your phone’s camera helps.
Why the last three digits matter
Collectors and checklist guides usually talk about the end of the code. For example, Beckett’s guide to 2026 Topps Chrome says the image variations have a code that ends in 752, and a 2026 Chrome image variation listed on eBay shows the full code CMP138752. Within one set, those last digits are enough to tell you what you have, and the lookup works the same way.
What’s in the lookup
It covers Topps baseball Series 1, Series 2, Update and Chrome from 2017 to 2026 (232 codes so far). Every code here is backed by a published checklist guide or a card we’ve seen, and each code page says where it comes from. Card lists come from Topps’s official checklists. Not every code in every set is known yet. Each set page also lists the parts of the checklist that don’t have a confirmed code yet.