Deluxe Signature Guide
Great aid guides you in signing important legal documents, banking records and other paperwork in the correct place. Rubber blocks, which act as left and right start and stop points, are 4-1/8 apart. 2 parallel metal rods for top and bottom alignment are 9/16apart.
More information: http://www.maxiaids.com/products/1253/Deluxe-Signature-Guide.html