I have a bunch of bricks from my childhood, some have grooves in the tubes underneath, some have the old style bubble logo, some have square holes under the plates. I am interested in general ages of each.

1 Answer 1


I can give you some help, especially if you are talking about 2x4 bricks. Last year, I embarked on a bit of a history project to trace the design changes in Lego, by looking at the 2x4 brick, from 1949 to today. (Such as changes in the tubes, like the slots you mention!) I talked to several very helpful collectors (some here on Bricks beta!), who gave me lots of helpful information. I distilled it all down into this article:


(This link goes to Part 2 of the article, because it contains a link for Part 1.) Keep in mind, though, that not all dates with Lego changes are hard-and-fast. You will see a few "c." meaning it was AT or AROUND that time--because as Lego changed molds, they didn't do it all at once, across the whole world. They used the old molds for their normal lifespans. There are even MORE sub-variations than what I have found, and there are links at the end of my post to some other good sources of information. Good luck! One thing about this hobby I can tell you, there are lots of knowledgeable and kind folks to help you!

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.