The LEGO Universal Building Set Supplemental theme, active from 1969 to 1976, offered additional elements to enhance and expand basic LEGO sets. Key sets include 990-2 Trees and Signs and its earlier variant 990 Trees and Signs, which provided decorative elements to add realism to LEGO creations. The 797 2 Large Baseplates Grey/White set offered foundational pieces for building larger and more stable structures. The 103 4.5V Motor Set with Rubber Tracks introduced motorized movement, allowing builders to create moving vehicles and machines.
Supplemental consists of 8 sets that ran from 1969 to 1976. As of today,
990-2 Trees and Signs is the most valuable Supplemental set with an estimated new/factory sealed value of $181.
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