
Supplemental sets are the parts packs of LEGO System i Leg, the System of Play that LEGO launched in 1955 to turn its bricks into one connected toy. Builders bought them to add more of the parts they needed, such as bricks in each size, windows and doors, roof bricks, plates and corner bricks. Others add details for the town plan of the time, such as Esso petrol pumps and signs, light masts, letter bricks, Danish and international flags and beams printed with Danish shop names.
Supplemental consists of 68 sets that ran from 1955 to 1959. As of today,
230-2 Six Trees and Bushes is the most valuable Supplemental set with an estimated new/factory sealed value of $324.
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