The LEGO System i Leg Basic Set theme, active during the late 1950s, includes foundational sets that were pivotal in the early development of LEGO's brick system. Notable sets in this theme include the "1234-4 LEGO Mursten System i Leg 1x1 Letter Bricks," which provided small, letter-printed bricks for building and learning, and the "LEGO Bricks Box" from 1958, which offered a variety of basic bricks for creative construction. These sets were crucial in establishing LEGO's reputation for innovative, interlocking bricks that encouraged creativity and learning.
Basic Set consists of 3 sets that ran from 1958 to 1959.
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