I have the calibration charts (2 pages) for a BC-906-A model. Serial No 300. Date 11-9-42 These are paper charts in a metal frame covered in clear plastic. Cover the postage in a padded envelope and they are yours. 73 Dave W7VT Phone or e-mail -- Dave Marquart 3100 E Victory Rd Meridian, ID 83642 208 559-4747 cell davemarquart at gmail.com