Image Item No. Description By  772  Brick 1 x 2 x 2 without Inside Axle Holder or Stud Holder X Catalog: Parts: Brick 24  3001special  Brick 2 x 4 special (special bricks, test bricks and/or prototypes) Catalog: Parts: Brick 4  700  Brick 10 x 20 (Undetermined Type) X Catalog: Parts: Brick 2