Vintage LEGO BASIC 520 Building Set 100% of Pieces, w/Instructions Partial Box | eBay
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Amazon.com: Eske Kouri Gobricks GDS-520 Plate 4 x 6 Compatible with Lego 3032 All Major Brick Brands Toys Building Blocks Technical Parts Assembles DIY (194 Light Bluish Gray(071),10 PCS) : Toys & Games
520 Basic Building Set - LEGO instructions and catalogs library