Depending on how close up you are going to be rendering the object - a quick and dirty way is to use the "project from view" UV-mapping option, and map the front and the back at the same time. There will still be a seam, two in fact, but not as noticeable as the texture will be mirrored around it.

Another, more time-consuming way, is to scale your object to fill the tiling texture and map the edge vertices along the seam to line up perfectly with the edge of the texture and with each other.  This will require manual moving of vertices. If you set the texture to repeat, it will still line up. Again, this is only suitable for some object shapes where tilint will work.

Poser 11 Pro, Windows 10

Auxiliary Apps: Blender 2.79, Vue Complete 2016, Genetica 4 Pro, Gliftex 11 Pro, CorelDraw Suite X6, Comic Life 2, Project Dogwaffle Howler 8, Stitch Witch