Hanno,
It's interesting that the photo you posted appears to show a mix of both Lithuanian M1934 and M1936 models, looking at the suspension bogies. A breakdown of the rather odd mix of armored vehicles present in the 12th Mechanized Corps in June 1941 can be found here:
http://rkkaww2.armchairgeneral.com/f...corps/12mk.htm
A total of 42 Vickers tankettes of all types were listed, including 5 of the 40mm gun-armed version. Apparently only about 13 of the 42 were still serviceable on 22 June 1941.
David