![BrickLink - Set 503-1 : LEGO Basic Building Set [Universal Building Set: Basic] - BrickLink Reference Catalog BrickLink - Set 503-1 : LEGO Basic Building Set [Universal Building Set: Basic] - BrickLink Reference Catalog](https://img.bricklink.com/ItemImage/SL/503-1.png)
BrickLink - Set 503-1 : LEGO Basic Building Set [Universal Building Set: Basic] - BrickLink Reference Catalog
![LEGO Set 557-1 Basic Building Set (1987 Universal Building Set > Basic) | Rebrickable - Build with LEGO LEGO Set 557-1 Basic Building Set (1987 Universal Building Set > Basic) | Rebrickable - Build with LEGO](https://cdn.rebrickable.com/media/thumbs/sets/557-1/8689.jpg/1000x800p.jpg)
LEGO Set 557-1 Basic Building Set (1987 Universal Building Set > Basic) | Rebrickable - Build with LEGO
![BrickLink - Set 550-1 : LEGO Basic Building Set [Universal Building Set: Basic] - BrickLink Reference Catalog BrickLink - Set 550-1 : LEGO Basic Building Set [Universal Building Set: Basic] - BrickLink Reference Catalog](https://img.bricklink.com/ItemImage/SL/550-1.png)
BrickLink - Set 550-1 : LEGO Basic Building Set [Universal Building Set: Basic] - BrickLink Reference Catalog
![BrickLink - Set 1-7 : LEGO Basic Set [Universal Building Set:Basic Set] - BrickLink Reference Catalog BrickLink - Set 1-7 : LEGO Basic Set [Universal Building Set:Basic Set] - BrickLink Reference Catalog](https://img.bricklink.com/ItemImage/SL/1-7.png)