A method and apparatus for making retro-reflective articles are described wherein continuous or large sheets of retro-reflective material can be made without visually disturbing seam lines. In one embodiment molds having retro-reflective elements have serrated edges along boundary lines of retro-reflective elements. In another embodiment the molds are provided with mold lines aligned with edges of the molds and so spaced from the edges that molds can be placed adjacent to one another as part of a grid pattern wherein seam lines are a part of the grid pattern and thus visually hidden. Articles made with molds having mold lines exhibit a regular grid pattern, but without an asymmetric seam line appearing on the article.