Generation 12

Summary

The 12 generation is easy to identify, as all bricks share a very identifiable characteristic - with their wide pip along the bottom edge. This kind of pip is not found in any other molds. Two different molds have been identified, where both have seen two steps in their evolution.

Differences between 12a/b and 12c/d

Mold Associations

flowchart LR
    R["Gen 12"] --> 12a --> 12b 
    R["Gen 12"] --> 12c --> 12d
    style R fill:#616161
    style 12a fill:#FF6D00,stroke:none
    style 12b fill:#FF6D00,stroke:none
    style 12c fill:#00C853,stroke:none
    style 12d fill:#00C853,stroke:none

12a-b

Bricks across the 12a and 12b molds are identical with the exception of their pips. In many cases it is also hard to differentiate bricks between "wide" and "short" pip-length, as the pip-lengths themselves vary a lot from mold position to mold position. As evident when stydying the bricks, there are in general two variants of pip-width found for each mold member, making it probable that the original mold was changed at a speicific time (in contrast to a longer evolution of mold member-specific changes).

12c-d

Bricks across the 12c and 12d molds have identical bottom, but are distinguishable on the top side by their stud patterns. Without exceptions, two different variations are identified for all 22 mold members. Unfortunately I have not been able to find a definitive pattern that places bricks in either the 12c or 12d mold. Based on the samples available, the differentiation has been done based on available colors. Bricks in the 12d mold are limited to White, Red (2 variants) and Transparent, while samples from 12c also come in Green, Blue and Yellow.