Test Molds in the Production Process
While we do not know how LEGO works exactly, we can make a reasonable guess about how the material flow …
Test
Test bricks were (and are) made internally by TLG or externally by chemical companies to test some properties of the brick.
3001 Old – 343 to 350 Inside Tubes
Unusual colors – found in Germany by Thomas Modern logo Inner ribs: Visible as a frosted line on both the …
LEGO: Bayer Trans-Green
Most likely these were used to discuss the greenness of LEGO trans-green bricks. The top right one comes close to …
3x Same Molding Mistake
3 bricks, most likely from the same mold. Old logo, pat.pend, even the same mold number, number 1. Richard has …