But then what if the no thing is the wrong thing?
In Zaloga’s
Stalin’s Heavy Tanks 1941–1945: The KV and IS Heavy Tanks (Hong Kong: Concord, 1997, ISBN 962-361-616-3) there are a couple of photos of KVs with DTM machine guns mounted on the commander’s hatch. Pages 21 and 22 have photos of a KV-8 (the KV-1 with flamethrower) captured by the Germans that has the mounting installed on the hatch — but of course, that could be because the Germans found it stowed inside the tank and decided to fit it for their photos. Page 23 shows a KV-1 model 1941 on a parade in 1942 with the MG installed, and on the next page is what seems like an in-action shot of a similar KV-1 with infantry on the engine deck and mudguards, also with a DT on the turret hatch. That’s it, though, largely because most of the rest of the book shows only IS tanks and ISU SP guns.