Answer 1:

I have received 5 replies so far. I will post each of them in a separate entry here for reference. Here is the first of them:

Re: T-26 Assault Gun Variants question
Posted by: "Eero Juhola" ejuhola@sci.fi ejuhola
Sun Feb 15, 2009 10:09 am (PST)

On Sun, 15 Feb 2009 14:27:42 -0000, sdean_796 wrote:
According to Google Red Hammers is from 1998 or thereabouts. T-26 nomenclature has changed recently. We used to have, for example, the T-26 model 1933 which are now called "T-26 of 1934 or 1935 manufacture", depending on the features of the tank in question... and what used to be a T-26 model 1939 is now a "T-26-1 of 1939 manufacture". It is possible that the models not mentioned in Red Hammers were called something else back when Sharp's book was researched.

Best regards, EJ