The Tankette a little tank
Documentary movie 35:00 minutes about polish TK-3/TKS with English subtitles
https://www.youtube.com/watch?v=a5aVlvqHDkI&t=7s
Best reconstruction and technical/operational aspects which I saw about those little tanks until now in movie. Story included interview with people who were responsible for reconstructions of surviving examples. Interesting aspect is that optics in postwar T-55 tanks have some rots in examples captured in Poland 1939.
director: Norbert Rudaś,
http://www.norbertrudas.pl/