Vintage Advertising Co-Re-Ga Letter Opener Folding Knife IK Company USA. Advertising letter opener and folding knife by IK CO, USA. Please see the pictures for item condition details. If you have any questions, don't hesitate to contact me and I'll get back with you right away. Blades are secure and the folding blade opens and closes with ease.  Total length with blade open is 11".  With the blade closed it's 8 7/8". Good vintage condition with some fading scuffs, scratches, and other imperfections.