I found and bought three photos of a KV-1, and if I'm not wrong, this is one of the relatively 'rare birds' with the M-17 engine.
According to Neil Stokes' great KV book, 37 KV-1 mod.1940 (LKZ) and 130 KV-1 mod.1941 (ChKZ) were fitted with this engine in September and November 1941, respectively, due to a shortage of V-2K engines.
Because of the higher fuel consumption of this engine, the vehicles carried additional fuel tanks.
Here the photos:
What do you guys think? Neil, are you reading, is this one of those?
(Please visit my Soviet tank photo gallery at rathgeb.smugmug.com!)