Quick Reference Guide – Is This a Test Brick?
“Is the brick I found special?” Part numbers: 3001old, 3001 and 3001special as used on BrickLink (but excluding the 3001oldf1 …
Production
A brick is considered a “production brick” if it is or was sold to the public in a LEGO® set (or similar).
Bricks With Cross-Support, Mold 174 Details
I found a few variations for mold 174. With good light and some magnification, the erased mold numbers can often …
Bricks With Cross-Support, Mold 133
Logo: modern logo Material: ABS Inner wall: thin with vertical ridges Inner ribs: Between the outer ridges on the long …
Bricks With Cross-Support, Mold 181
Logo: modern logo Material: ABS Inner wall: thin with vertical ridges Inner ribs: Between the outer ridges on the long …
LEGO Logos
My summary of the 6 logos seen on 3001old 2×4 bricks. Wide logos touch the sides of the studs – …
3001old Without Cross Support – PIP Stud – Number Above and Below Tubes
3001old without cross support, with the mold pip on the stud, and the mold number above and/or below the tubes. …
3001oldf1 – 343 to 358 Inside Tubes
Logo: Modern logo. Material: Polycarbonate (ABS is not transparent) Inner ribs: yes. Visible as a frosted line on both the …
3001 Without Cross Support – Number Inside Tubes
Most of the 3001old bricks with the mold number inside the tubes were made in white, red, blue, yellow, black …
3001old with Split Tubes – Inner Wall Variations on Mold Numbers 77 to 96
The molds for the bricks with split tubes and mold numbers 77 to 97 were revised a few times. I …
3001old with Split Tubes
In 1973 LEGO introduced a new version of the brick. (Drawing date according to LEGO vs Tyco, introduction into sets …