Commemorative version of the Fed 2d, issued in 1967 to commemorate the 50th Anniversary of the October Revolution.
Actually just a commemorative box, since both the camera and the lens shows no evidence of commemorative inscriptions or logos.
Camera S/N: 6749397
Lens S/N: 6761196
See classificator by Aidas P at http://www.sovietcams.com/index.php?-1620130885