We have late interwar tanks. Nearly all of the early 1930s tanks are absent, and the A1E1 and the char 2C bis are the only 1920s tanks. The only outliers are the I-Go Ko, which is a late 1933 model (stepped front, late model cupola, but no improved suspension or hull machine gunner-driver placement swaps introduced in the 1934 productions), the BT-5 built in 1933, the T-26-4 and the SU-5-1 which were both built in 1934, the char 2C which we have the 1930 modification of, and the strv m/31 built in 1933.
Everything else is 1935+.
M2A2 Light? Introduced in 1935. M2A4 Light? 1940. M2 Medium? 1939, only scratching into the interwar period on the technicality of the T5 Mediums finding their origins in 1936 with the first prototype being produced in 1937.
Pz. Kpfw. III Ausf. B? 1937, but we have the 1938 modifications in-game that installed smoke launchers and an improved towing cable. Ausf. E? 1939, but again the later 1939 modifications that installed smoke launchers and an observation port for the radio operator-hull machine gunner. Pz. Kpfw. IV Ausf. C? 1938 tank with the late 1939 modification in-game. Pz. Kpfw. II Ausf. C? 1938 tank with the 1941 modification in-game. Pz. Kpfw. II Ausf. F and Pz. Kpfw. IV Ausf. E? Both war-time productions. Sd. Kfz. 222? 3rd series production started in 1939, with the later 1942 modification in-game. Nb. Fz.? 1936 Krupp productions. Even the Pz. Kpfw. 35 (t) were produced in 1936, as the earliest tanks in the German tree.
BT-7? 1937. BT-7M? 1939. T-26? Also 1939. T-28? Earliest model we have is the 1936 production. T-60? War-time tank, and a 1942 production rather than the original run with lighter armor.
Britain is even worse than Germany. A13s? 1939, they hardly even qualify as interwar. Tetrarch? 1938. Daimler? War-time. Matilda II? 1937 tank, but we have the 1939 modification with the BESA instead of the original Vickers machine guns. Though, they also have the earliest tanks in the game, that being the A1E1 and the Mk. V.
Ha-Go? 1935, but we have the later 1937 model with the 7.7 mm machine guns. Ke-Ni? 1938. Chi-Ha? 1938. Ro-Go? 1935. Everything else is war-time.
Italy? M 11/39, and only barely. Nothing else. Everything else are war-time vehicles, though both the L 6/40 and the M 13/40 have links to interwar tank projects.
France? The bulk of their interwar vehicles are 1938 or 1939 modifications. R.35? We have the rare 1939 modification that rearmed the tank with the SA 38. H.39? Same thing, albeit less rare since SA 38 were prioritized for them. D2? Later 1937 productions instead of the original 1935 productions. S.35? The only tank in its original 1936 form (that isn’t also hidden) in the tree. AMC.35? 1938 tank, despite the name. AMD.35? 1937. AMR.35 ZT 3? 1938. SAu 40 and Lorraine? 1939. B1? We have the 1937 bis and the 1940 ter, we don’t have the original 1935 tank.
Strv m/38? 1939. Finnish Vickers? 1938, and the modified T-26E are from 1940.
China and Israel aren’t even worth mentioning.